
Acta Cryst. (2008). E64, o1012 [ doi:10.1107/S1600536808012567 ]
X-ray crystallography unequivocally shows that protection of the free hydroxyl group of 3,5-O-benzylidene-D-xylono-1,4-lactone with diphenyldiazomethane proceeded smoothly to give the title compound, C25H22O5, with no accompanying epimerization. Unlike the analogously protected lyxono lactone, the isomeric xylono lactone has two molecules present in the asymmetric unit (Z' = 2). The 5-ring lactones adopt envelope conformations and the 6-ring ketals adopt chair conformations.
The title lactone was recrystallized from a 1:1 mixture of ethyl acetate and cyclohexane: m.p. 395–397 K; [α]D23 +129.1 (c, 1.02 in CHCl3).
In the absence of significant anomalous scattering, Friedel pairs were merged and the absolute configuration was assigned from the starting material.
The relatively large ratio of minimum to maximum corrections applied in the multiscan process (1:1.80) reflect changes in the illuminated volume of the crystal. Changes in illuminated volume were kept to a minimum, and were taken into account (Görbitz, 1999) by the multi-scan inter-frame scaling (DENZO/SCALEPACK, Otwinowski & Minor, 1997).
The H atoms were all located in a difference map, but those attached to carbon atoms were repositioned geometrically. The H atoms were initially refined with soft restraints on the bond lengths and angles to regularize their geometry (C—H in the range 0.93–0.98, O—H = 0.82 Å) and Uiso(H) (in the range 1.2–1.5 times Ueq of the parent atom), after which the positions were refined with riding constraints.
Data collection: COLLECT (Nonius, 2001).; cell refinement: DENZO/SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO/SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: CAMERON (Watkin et al., 1996); software used to prepare material for publication: CRYSTALS (Betteridge et al., 2003).
| C25H22O5 | F000 = 848 |
| Mr = 402.45 | Dx = 1.304 Mg m−3 |
| Monoclinic, P21 | Mo Kα radiation λ = 0.71073 Å |
| Hall symbol: P 2yb | Cell parameters from 4834 reflections |
| a = 14.8159 (3) Å | θ = 5–27º |
| b = 9.1959 (2) Å | µ = 0.09 mm−1 |
| c = 15.0797 (2) Å | T = 150 K |
| β = 93.7245 (12)º | Plate, colourless |
| V = 2050.20 (7) Å3 | 0.80 × 0.30 × 0.10 mm |
| Z = 4 |
| Nonius KappaCCD area-detector diffractometer | 3950 reflections with I > 2σ(I) |
| Monochromator: graphite | Rint = 0.047 |
| T = 150 K | θmax = 27.5º |
| ω scans | θmin = 5.2º |
| Absorption correction: multi-scan (DENZO/SCALEPACK; Otwinowski & Minor, 1997) | h = −19→19 |
| Tmin = 0.55, Tmax = 0.99 | k = −11→11 |
| 25081 measured reflections | l = −19→19 |
| 4938 independent reflections |
| Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
| Least-squares matrix: full | H-atom parameters constrained |
| R[F2 > 2σ(F2)] = 0.034 | Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982)
[weight] = 1.0/[A0*T0(x) + A1*T1(x) ··· + An-1]*Tn-1(x)]
where Ai are the Chebychev coefficients listed below and x = F /Fmax Method = Robust Weighting (Prince, 1982) W = [weight] * [1-(deltaF/6*sigmaF)2]2 Ai are: 16.9 24.9 12.6 3.46 |
| wR(F2) = 0.101 | (Δ/σ)max = 0.0003 |
| S = 0.89 | Δρmax = 0.25 e Å−3 |
| 4938 reflections | Δρmin = −0.27 e Å−3 |
| 542 parameters | Extinction correction: Larson (1970), Equation 22 |
| 1 restraint | Extinction coefficient: 600 (50) |
| Primary atom site location: structure-invariant direct methods |
| C25H22O5 | V = 2050.20 (7) Å3 |
| Mr = 402.45 | Z = 4 |
| Monoclinic, P21 | Mo Kα |
| a = 14.8159 (3) Å | µ = 0.09 mm−1 |
| b = 9.1959 (2) Å | T = 150 K |
| c = 15.0797 (2) Å | 0.80 × 0.30 × 0.10 mm |
| β = 93.7245 (12)º |
| Nonius KappaCCD area-detector diffractometer | 4938 independent reflections |
| Absorption correction: multi-scan (DENZO/SCALEPACK; Otwinowski & Minor, 1997) | 3950 reflections with I > 2σ(I) |
| Tmin = 0.55, Tmax = 0.99 | Rint = 0.047 |
| 25081 measured reflections |
| R[F2 > 2σ(F2)] = 0.034 | H-atom parameters constrained |
| wR(F2) = 0.101 | Δρmax = 0.25 e Å−3 |
| S = 0.89 | Δρmin = −0.27 e Å−3 |
| 4938 reflections | Absolute structure: ? |
| 542 parameters | Flack parameter: ? |
| 1 restraint | Rogers parameter: ? |
| x | y | z | Uiso*/Ueq | ||
| O1 | 0.44166 (10) | 0.5327 (2) | 0.31715 (10) | 0.0244 | |
| C2 | 0.40499 (15) | 0.5336 (3) | 0.22694 (15) | 0.0242 | |
| C3 | 0.30725 (16) | 0.4866 (3) | 0.23203 (15) | 0.0254 | |
| O4 | 0.25857 (10) | 0.5219 (2) | 0.15093 (10) | 0.0265 | |
| C5 | 0.16129 (15) | 0.5192 (3) | 0.15751 (16) | 0.0257 | |
| C6 | 0.13142 (16) | 0.6490 (3) | 0.21052 (15) | 0.0252 | |
| C7 | 0.17991 (18) | 0.7781 (3) | 0.21395 (18) | 0.0330 | |
| C8 | 0.1517 (2) | 0.8947 (3) | 0.26476 (19) | 0.0403 | |
| C9 | 0.0760 (2) | 0.8806 (3) | 0.31222 (18) | 0.0432 | |
| C10 | 0.0264 (2) | 0.7539 (4) | 0.30826 (19) | 0.0437 | |
| C11 | 0.05367 (19) | 0.6375 (3) | 0.25762 (17) | 0.0335 | |
| C12 | 0.12135 (15) | 0.5140 (3) | 0.06274 (15) | 0.0255 | |
| C13 | 0.15139 (19) | 0.6107 (3) | 0.00038 (17) | 0.0339 | |
| C14 | 0.1185 (2) | 0.6028 (4) | −0.08784 (18) | 0.0429 | |
| C15 | 0.0551 (2) | 0.4987 (4) | −0.11333 (19) | 0.0486 | |
| C16 | 0.02472 (19) | 0.4030 (4) | −0.0519 (2) | 0.0479 | |
| C17 | 0.05739 (17) | 0.4106 (4) | 0.03651 (19) | 0.0368 | |
| C18 | 0.31556 (18) | 0.3212 (3) | 0.23435 (18) | 0.0323 | |
| O19 | 0.26098 (14) | 0.2338 (2) | 0.25627 (16) | 0.0478 | |
| O20 | 0.39494 (13) | 0.2813 (2) | 0.20131 (13) | 0.0344 | |
| C21 | 0.44429 (17) | 0.4094 (3) | 0.17435 (16) | 0.0296 | |
| C22 | 0.54422 (17) | 0.3886 (3) | 0.19447 (16) | 0.0335 | |
| O23 | 0.56825 (11) | 0.3965 (2) | 0.28758 (11) | 0.0301 | |
| C24 | 0.53776 (15) | 0.5268 (3) | 0.32352 (15) | 0.0255 | |
| C25 | 0.56837 (16) | 0.5320 (3) | 0.42104 (16) | 0.0277 | |
| C26 | 0.53029 (17) | 0.6335 (3) | 0.47592 (17) | 0.0318 | |
| C27 | 0.5559 (2) | 0.6362 (4) | 0.56635 (19) | 0.0417 | |
| C28 | 0.6204 (2) | 0.5396 (4) | 0.6014 (2) | 0.0479 | |
| C29 | 0.6607 (2) | 0.4425 (4) | 0.5464 (2) | 0.0479 | |
| C30 | 0.63432 (19) | 0.4375 (3) | 0.45597 (19) | 0.0359 | |
| O101 | 0.17514 (11) | 0.3628 (2) | 0.56763 (10) | 0.0280 | |
| C102 | 0.26545 (16) | 0.3497 (3) | 0.60615 (15) | 0.0265 | |
| C103 | 0.26225 (16) | 0.3956 (3) | 0.70212 (16) | 0.0266 | |
| O104 | 0.34196 (11) | 0.3412 (2) | 0.74916 (10) | 0.0274 | |
| C105 | 0.33862 (16) | 0.3463 (3) | 0.84483 (15) | 0.0254 | |
| C106 | 0.27885 (16) | 0.2264 (3) | 0.87746 (17) | 0.0275 | |
| C107 | 0.25628 (19) | 0.1047 (3) | 0.82618 (19) | 0.0368 | |
| C108 | 0.2043 (2) | −0.0056 (4) | 0.8592 (2) | 0.0473 | |
| C109 | 0.17436 (19) | 0.0054 (4) | 0.9435 (3) | 0.0506 | |
| C110 | 0.1966 (2) | 0.1261 (4) | 0.9956 (2) | 0.0512 | |
| C111 | 0.2483 (2) | 0.2372 (4) | 0.9627 (2) | 0.0394 | |
| C112 | 0.43660 (16) | 0.3392 (3) | 0.88150 (15) | 0.0254 | |
| C113 | 0.49799 (18) | 0.4396 (3) | 0.85136 (18) | 0.0320 | |
| C114 | 0.58750 (19) | 0.4422 (3) | 0.8863 (2) | 0.0383 | |
| C115 | 0.61626 (18) | 0.3427 (3) | 0.95059 (18) | 0.0348 | |
| C116 | 0.55682 (18) | 0.2406 (3) | 0.97998 (16) | 0.0318 | |
| C117 | 0.46694 (17) | 0.2387 (3) | 0.94582 (15) | 0.0276 | |
| C118 | 0.27224 (17) | 0.5609 (3) | 0.69587 (17) | 0.0307 | |
| O119 | 0.25584 (16) | 0.6510 (3) | 0.75019 (14) | 0.0446 | |
| O120 | 0.30885 (13) | 0.5960 (2) | 0.61933 (12) | 0.0333 | |
| C121 | 0.32735 (16) | 0.4648 (3) | 0.56966 (16) | 0.0299 | |
| C122 | 0.30971 (17) | 0.4926 (4) | 0.47132 (17) | 0.0357 | |
| O123 | 0.21497 (11) | 0.4979 (2) | 0.44632 (11) | 0.0315 | |
| C124 | 0.17243 (16) | 0.3695 (3) | 0.47308 (15) | 0.0280 | |
| C125 | 0.07503 (16) | 0.3717 (3) | 0.43830 (16) | 0.0286 | |
| C126 | 0.01418 (18) | 0.4674 (3) | 0.47230 (17) | 0.0354 | |
| C127 | −0.07582 (19) | 0.4661 (4) | 0.44074 (19) | 0.0426 | |
| C128 | −0.10512 (19) | 0.3684 (4) | 0.3750 (2) | 0.0417 | |
| C129 | −0.0444 (2) | 0.2749 (4) | 0.3393 (2) | 0.0412 | |
| C130 | 0.0462 (2) | 0.2761 (3) | 0.37099 (18) | 0.0344 | |
| H21 | 0.4102 | 0.6308 | 0.1980 | 0.0310* | |
| H31 | 0.2815 | 0.5292 | 0.2838 | 0.0300* | |
| H51 | 0.1461 | 0.4285 | 0.1912 | 0.0293* | |
| H71 | 0.2332 | 0.7897 | 0.1793 | 0.0378* | |
| H81 | 0.1854 | 0.9828 | 0.2657 | 0.0498* | |
| H91 | 0.0574 | 0.9586 | 0.3462 | 0.0522* | |
| H101 | −0.0270 | 0.7456 | 0.3417 | 0.0499* | |
| H111 | 0.0193 | 0.5507 | 0.2559 | 0.0398* | |
| H131 | 0.1944 | 0.6831 | 0.0155 | 0.0428* | |
| H141 | 0.1417 | 0.6660 | −0.1305 | 0.0511* | |
| H151 | 0.0293 | 0.4918 | −0.1722 | 0.0598* | |
| H161 | −0.0195 | 0.3290 | −0.0668 | 0.0570* | |
| H171 | 0.0384 | 0.3446 | 0.0768 | 0.0465* | |
| H211 | 0.4312 | 0.4257 | 0.1074 | 0.0355* | |
| H221 | 0.5780 | 0.4629 | 0.1587 | 0.0427* | |
| H222 | 0.5617 | 0.2896 | 0.1766 | 0.0439* | |
| H241 | 0.5627 | 0.6105 | 0.2909 | 0.0328* | |
| H261 | 0.4846 | 0.7013 | 0.4543 | 0.0393* | |
| H271 | 0.5298 | 0.7065 | 0.6043 | 0.0510* | |
| H281 | 0.6372 | 0.5419 | 0.6640 | 0.0566* | |
| H291 | 0.7087 | 0.3765 | 0.5704 | 0.0512* | |
| H301 | 0.6622 | 0.3686 | 0.4199 | 0.0430* | |
| H1021 | 0.2909 | 0.2513 | 0.5939 | 0.0322* | |
| H1031 | 0.2066 | 0.3671 | 0.7308 | 0.0308* | |
| H1051 | 0.3131 | 0.4449 | 0.8589 | 0.0297* | |
| H1071 | 0.2755 | 0.0977 | 0.7683 | 0.0447* | |
| H1081 | 0.1886 | −0.0904 | 0.8241 | 0.0582* | |
| H1091 | 0.1414 | −0.0692 | 0.9676 | 0.0609* | |
| H1101 | 0.1777 | 0.1334 | 1.0531 | 0.0637* | |
| H1111 | 0.2619 | 0.3211 | 0.9967 | 0.0452* | |
| H1131 | 0.4790 | 0.5064 | 0.8020 | 0.0373* | |
| H1141 | 0.6288 | 0.5114 | 0.8631 | 0.0459* | |
| H1151 | 0.6769 | 0.3437 | 0.9745 | 0.0399* | |
| H1161 | 0.5788 | 0.1694 | 1.0226 | 0.0391* | |
| H1171 | 0.4223 | 0.1678 | 0.9652 | 0.0343* | |
| H1211 | 0.3914 | 0.4381 | 0.5851 | 0.0389* | |
| H1221 | 0.3378 | 0.5873 | 0.4563 | 0.0426* | |
| H1222 | 0.3394 | 0.4138 | 0.4383 | 0.0433* | |
| H1241 | 0.2031 | 0.2834 | 0.4506 | 0.0363* | |
| H1261 | 0.0340 | 0.5326 | 0.5187 | 0.0406* | |
| H1271 | −0.1184 | 0.5305 | 0.4660 | 0.0513* | |
| H1281 | −0.1677 | 0.3670 | 0.3552 | 0.0470* | |
| H1291 | −0.0649 | 0.2101 | 0.2929 | 0.0471* | |
| H1301 | 0.0895 | 0.2105 | 0.3457 | 0.0399* |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| O1 | 0.0232 (7) | 0.0288 (9) | 0.0210 (7) | −0.0002 (7) | 0.0005 (6) | −0.0019 (7) |
| C2 | 0.0265 (11) | 0.0255 (12) | 0.0202 (10) | 0.0009 (9) | −0.0007 (8) | 0.0009 (9) |
| C3 | 0.0275 (11) | 0.0277 (13) | 0.0209 (10) | −0.0006 (10) | −0.0001 (8) | 0.0048 (10) |
| O4 | 0.0243 (8) | 0.0340 (10) | 0.0209 (7) | 0.0030 (7) | −0.0011 (6) | 0.0044 (7) |
| C5 | 0.0245 (11) | 0.0251 (12) | 0.0276 (11) | −0.0001 (10) | 0.0017 (8) | 0.0027 (10) |
| C6 | 0.0300 (11) | 0.0240 (11) | 0.0211 (10) | 0.0031 (10) | −0.0022 (8) | 0.0024 (9) |
| C7 | 0.0352 (13) | 0.0288 (13) | 0.0346 (13) | −0.0016 (11) | −0.0004 (10) | −0.0027 (11) |
| C8 | 0.0518 (16) | 0.0289 (14) | 0.0387 (14) | −0.0017 (13) | −0.0081 (12) | −0.0037 (12) |
| C9 | 0.0659 (19) | 0.0334 (16) | 0.0298 (13) | 0.0140 (15) | 0.0001 (12) | −0.0040 (12) |
| C10 | 0.0570 (18) | 0.0398 (17) | 0.0361 (15) | 0.0146 (14) | 0.0169 (13) | 0.0055 (13) |
| C11 | 0.0390 (13) | 0.0283 (13) | 0.0341 (13) | 0.0044 (11) | 0.0094 (10) | 0.0046 (11) |
| C12 | 0.0239 (10) | 0.0255 (12) | 0.0269 (11) | 0.0055 (9) | −0.0005 (8) | −0.0051 (10) |
| C13 | 0.0413 (14) | 0.0298 (14) | 0.0296 (12) | −0.0048 (11) | −0.0048 (10) | −0.0012 (11) |
| C14 | 0.0528 (17) | 0.0505 (18) | 0.0244 (13) | 0.0027 (15) | −0.0041 (11) | 0.0001 (13) |
| C15 | 0.0420 (15) | 0.072 (2) | 0.0303 (13) | 0.0034 (16) | −0.0085 (11) | −0.0144 (16) |
| C16 | 0.0305 (13) | 0.066 (2) | 0.0468 (16) | −0.0103 (15) | −0.0029 (11) | −0.0195 (17) |
| C17 | 0.0269 (12) | 0.0416 (16) | 0.0422 (14) | −0.0072 (12) | 0.0034 (10) | −0.0072 (13) |
| C18 | 0.0321 (13) | 0.0315 (14) | 0.0318 (13) | −0.0024 (11) | −0.0098 (10) | 0.0067 (11) |
| O19 | 0.0394 (11) | 0.0384 (12) | 0.0638 (14) | −0.0101 (10) | −0.0106 (10) | 0.0201 (11) |
| O20 | 0.0399 (10) | 0.0248 (9) | 0.0376 (10) | 0.0003 (8) | −0.0035 (8) | −0.0012 (8) |
| C21 | 0.0357 (12) | 0.0308 (13) | 0.0223 (10) | 0.0026 (11) | 0.0027 (9) | −0.0005 (10) |
| C22 | 0.0373 (13) | 0.0370 (14) | 0.0267 (12) | 0.0071 (12) | 0.0052 (10) | −0.0038 (11) |
| O23 | 0.0300 (8) | 0.0340 (10) | 0.0264 (8) | 0.0074 (8) | 0.0021 (6) | −0.0025 (8) |
| C24 | 0.0224 (10) | 0.0262 (12) | 0.0282 (11) | 0.0001 (10) | 0.0032 (8) | −0.0014 (10) |
| C25 | 0.0245 (11) | 0.0280 (12) | 0.0303 (12) | −0.0073 (10) | −0.0004 (9) | −0.0015 (10) |
| C26 | 0.0289 (12) | 0.0327 (14) | 0.0336 (13) | −0.0030 (11) | 0.0009 (9) | −0.0074 (11) |
| C27 | 0.0428 (15) | 0.0469 (18) | 0.0350 (14) | −0.0127 (14) | −0.0017 (11) | −0.0100 (14) |
| C28 | 0.0585 (19) | 0.0486 (18) | 0.0344 (14) | −0.0137 (16) | −0.0135 (13) | −0.0068 (14) |
| C29 | 0.0542 (18) | 0.0407 (18) | 0.0456 (17) | 0.0004 (15) | −0.0219 (14) | −0.0023 (14) |
| C30 | 0.0372 (13) | 0.0318 (14) | 0.0373 (14) | 0.0023 (11) | −0.0080 (11) | −0.0043 (12) |
| O101 | 0.0258 (8) | 0.0354 (10) | 0.0223 (8) | −0.0028 (7) | −0.0020 (6) | 0.0045 (7) |
| C102 | 0.0243 (11) | 0.0282 (12) | 0.0268 (11) | 0.0022 (10) | −0.0011 (8) | 0.0006 (10) |
| C103 | 0.0230 (10) | 0.0315 (13) | 0.0249 (11) | 0.0045 (10) | 0.0002 (8) | 0.0039 (10) |
| O104 | 0.0251 (8) | 0.0349 (10) | 0.0219 (8) | 0.0045 (7) | −0.0009 (6) | 0.0021 (7) |
| C105 | 0.0276 (11) | 0.0253 (12) | 0.0234 (10) | 0.0012 (10) | 0.0017 (8) | 0.0004 (10) |
| C106 | 0.0224 (11) | 0.0293 (13) | 0.0309 (12) | 0.0040 (10) | 0.0017 (9) | 0.0040 (10) |
| C107 | 0.0379 (14) | 0.0348 (15) | 0.0367 (14) | −0.0038 (12) | −0.0050 (11) | 0.0054 (12) |
| C108 | 0.0436 (16) | 0.0373 (17) | 0.0591 (19) | −0.0105 (14) | −0.0108 (13) | 0.0091 (15) |
| C109 | 0.0315 (14) | 0.0453 (19) | 0.075 (2) | 0.0004 (13) | 0.0064 (14) | 0.0245 (18) |
| C110 | 0.0442 (17) | 0.052 (2) | 0.060 (2) | 0.0125 (16) | 0.0272 (15) | 0.0164 (17) |
| C111 | 0.0377 (14) | 0.0385 (16) | 0.0435 (15) | 0.0096 (13) | 0.0152 (12) | 0.0036 (13) |
| C112 | 0.0268 (11) | 0.0262 (12) | 0.0230 (10) | 0.0003 (10) | 0.0003 (8) | −0.0033 (9) |
| C113 | 0.0333 (12) | 0.0267 (13) | 0.0356 (13) | −0.0018 (10) | −0.0012 (10) | 0.0016 (11) |
| C114 | 0.0342 (14) | 0.0329 (15) | 0.0473 (15) | −0.0060 (12) | −0.0002 (11) | −0.0029 (13) |
| C115 | 0.0284 (12) | 0.0387 (15) | 0.0363 (13) | 0.0009 (11) | −0.0051 (10) | −0.0111 (12) |
| C116 | 0.0329 (13) | 0.0377 (15) | 0.0239 (11) | 0.0081 (11) | −0.0051 (9) | −0.0038 (11) |
| C117 | 0.0307 (12) | 0.0303 (13) | 0.0215 (10) | 0.0026 (10) | 0.0008 (9) | −0.0010 (10) |
| C118 | 0.0294 (12) | 0.0332 (14) | 0.0291 (12) | 0.0039 (10) | −0.0005 (9) | 0.0015 (11) |
| O119 | 0.0597 (13) | 0.0362 (11) | 0.0382 (10) | 0.0110 (10) | 0.0052 (9) | −0.0041 (10) |
| O120 | 0.0381 (10) | 0.0317 (10) | 0.0304 (9) | −0.0055 (8) | 0.0030 (7) | 0.0035 (8) |
| C121 | 0.0255 (11) | 0.0375 (14) | 0.0268 (11) | −0.0026 (11) | 0.0028 (9) | −0.0006 (11) |
| C122 | 0.0268 (12) | 0.0527 (18) | 0.0278 (12) | −0.0056 (12) | 0.0041 (9) | 0.0032 (13) |
| O123 | 0.0274 (8) | 0.0407 (11) | 0.0264 (8) | −0.0048 (8) | 0.0019 (6) | 0.0068 (8) |
| C124 | 0.0308 (11) | 0.0300 (13) | 0.0231 (11) | −0.0002 (10) | 0.0019 (9) | 0.0024 (10) |
| C125 | 0.0297 (12) | 0.0313 (13) | 0.0247 (11) | −0.0025 (10) | 0.0010 (9) | 0.0040 (10) |
| C126 | 0.0334 (13) | 0.0430 (16) | 0.0294 (12) | 0.0014 (12) | −0.0004 (10) | −0.0060 (12) |
| C127 | 0.0342 (13) | 0.0577 (19) | 0.0359 (14) | 0.0035 (14) | 0.0024 (11) | 0.0010 (14) |
| C128 | 0.0325 (13) | 0.0510 (19) | 0.0407 (14) | −0.0064 (13) | −0.0058 (11) | 0.0092 (14) |
| C129 | 0.0456 (16) | 0.0385 (16) | 0.0380 (14) | −0.0092 (13) | −0.0091 (12) | −0.0012 (13) |
| C130 | 0.0420 (14) | 0.0284 (13) | 0.0319 (13) | −0.0018 (12) | −0.0050 (11) | −0.0005 (11) |
| O1—C2 | 1.432 (3) | O101—C102 | 1.429 (3) |
| O1—C24 | 1.422 (3) | O101—C124 | 1.425 (3) |
| C2—C3 | 1.518 (3) | C102—C103 | 1.511 (3) |
| C2—C21 | 1.527 (4) | C102—C121 | 1.526 (4) |
| C2—H21 | 1.000 | C102—H1021 | 1.002 |
| C3—O4 | 1.416 (3) | C103—O104 | 1.428 (3) |
| C3—C18 | 1.526 (4) | C103—C118 | 1.531 (4) |
| C3—H31 | 0.973 | C103—H1031 | 0.991 |
| O4—C5 | 1.451 (3) | O104—C105 | 1.448 (3) |
| C5—C6 | 1.518 (3) | C105—C106 | 1.516 (3) |
| C5—C12 | 1.512 (3) | C105—C112 | 1.521 (3) |
| C5—H51 | 1.009 | C105—H1051 | 1.011 |
| C6—C7 | 1.387 (4) | C106—C107 | 1.388 (4) |
| C6—C11 | 1.396 (3) | C106—C111 | 1.393 (4) |
| C7—C8 | 1.398 (4) | C107—C108 | 1.385 (4) |
| C7—H71 | 0.980 | C107—H1071 | 0.938 |
| C8—C9 | 1.374 (4) | C108—C109 | 1.377 (5) |
| C8—H81 | 0.952 | C108—H1081 | 0.963 |
| C9—C10 | 1.377 (5) | C109—C110 | 1.387 (5) |
| C9—H91 | 0.933 | C109—H1091 | 0.930 |
| C10—C11 | 1.390 (4) | C110—C111 | 1.388 (5) |
| C10—H101 | 0.969 | C110—H1101 | 0.932 |
| C11—H111 | 0.947 | C111—H1111 | 0.941 |
| C12—C13 | 1.388 (4) | C112—C113 | 1.393 (4) |
| C12—C17 | 1.382 (4) | C112—C117 | 1.393 (3) |
| C13—C14 | 1.389 (4) | C113—C114 | 1.395 (4) |
| C13—H131 | 0.939 | C113—H1131 | 0.991 |
| C14—C15 | 1.378 (5) | C114—C115 | 1.381 (4) |
| C14—H141 | 0.948 | C114—H1141 | 0.964 |
| C15—C16 | 1.374 (5) | C115—C116 | 1.380 (4) |
| C15—H151 | 0.946 | C115—H1151 | 0.946 |
| C16—C17 | 1.390 (4) | C116—C117 | 1.396 (3) |
| C16—H161 | 0.961 | C116—H1161 | 0.960 |
| C17—H171 | 0.916 | C117—H1171 | 0.986 |
| C18—O19 | 1.202 (3) | C118—O119 | 1.201 (3) |
| C18—O20 | 1.357 (3) | C118—O120 | 1.346 (3) |
| O20—C21 | 1.458 (3) | O120—C121 | 1.456 (3) |
| C21—C22 | 1.504 (4) | C121—C122 | 1.511 (3) |
| C21—H211 | 1.026 | C121—H1211 | 0.994 |
| C22—O23 | 1.428 (3) | C122—O123 | 1.430 (3) |
| C22—H221 | 1.021 | C122—H1221 | 0.998 |
| C22—H222 | 0.989 | C122—H1222 | 0.998 |
| O23—C24 | 1.402 (3) | O123—C124 | 1.409 (3) |
| C24—C25 | 1.511 (3) | C124—C125 | 1.503 (3) |
| C24—H241 | 0.997 | C124—H1241 | 0.984 |
| C25—C26 | 1.392 (4) | C125—C126 | 1.382 (4) |
| C25—C30 | 1.385 (4) | C125—C130 | 1.389 (4) |
| C26—C27 | 1.392 (4) | C126—C127 | 1.387 (4) |
| C26—H261 | 0.961 | C126—H1261 | 0.953 |
| C27—C28 | 1.385 (5) | C127—C128 | 1.386 (5) |
| C27—H271 | 0.961 | C127—H1271 | 0.962 |
| C28—C29 | 1.380 (5) | C128—C129 | 1.379 (5) |
| C28—H281 | 0.962 | C128—H1281 | 0.955 |
| C29—C30 | 1.394 (4) | C129—C130 | 1.394 (4) |
| C29—H291 | 0.986 | C129—H1291 | 0.954 |
| C30—H301 | 0.948 | C130—H1301 | 0.977 |
| C2—O1—C24 | 112.39 (17) | C102—O101—C124 | 112.03 (17) |
| O1—C2—C3 | 104.75 (18) | O101—C102—C103 | 106.20 (18) |
| O1—C2—C21 | 110.80 (19) | O101—C102—C121 | 111.3 (2) |
| C3—C2—C21 | 102.2 (2) | C103—C102—C121 | 102.0 (2) |
| O1—C2—H21 | 112.6 | O101—C102—H1021 | 110.8 |
| C3—C2—H21 | 112.2 | C103—C102—H1021 | 117.7 |
| C21—C2—H21 | 113.5 | C121—C102—H1021 | 108.5 |
| C2—C3—O4 | 108.98 (18) | C102—C103—O104 | 107.53 (19) |
| C2—C3—C18 | 102.1 (2) | C102—C103—C118 | 102.1 (2) |
| O4—C3—C18 | 106.5 (2) | O104—C103—C118 | 107.4 (2) |
| C2—C3—H31 | 110.6 | C102—C103—H1031 | 115.0 |
| O4—C3—H31 | 113.3 | O104—C103—H1031 | 112.1 |
| C18—C3—H31 | 114.7 | C118—C103—H1031 | 112.1 |
| C3—O4—C5 | 112.91 (17) | C103—O104—C105 | 113.76 (17) |
| O4—C5—C6 | 110.32 (19) | O104—C105—C106 | 111.0 (2) |
| O4—C5—C12 | 105.39 (18) | O104—C105—C112 | 105.51 (17) |
| C6—C5—C12 | 114.4 (2) | C106—C105—C112 | 114.5 (2) |
| O4—C5—H51 | 107.6 | O104—C105—H1051 | 106.0 |
| C6—C5—H51 | 107.6 | C106—C105—H1051 | 110.5 |
| C12—C5—H51 | 111.3 | C112—C105—H1051 | 108.9 |
| C5—C6—C7 | 121.7 (2) | C105—C106—C107 | 122.0 (2) |
| C5—C6—C11 | 119.1 (2) | C105—C106—C111 | 118.6 (2) |
| C7—C6—C11 | 119.2 (2) | C107—C106—C111 | 119.4 (3) |
| C6—C7—C8 | 120.3 (3) | C106—C107—C108 | 120.6 (3) |
| C6—C7—H71 | 120.5 | C106—C107—H1071 | 119.8 |
| C8—C7—H71 | 119.2 | C108—C107—H1071 | 119.6 |
| C7—C8—C9 | 119.7 (3) | C107—C108—C109 | 119.9 (3) |
| C7—C8—H81 | 119.1 | C107—C108—H1081 | 121.1 |
| C9—C8—H81 | 121.2 | C109—C108—H1081 | 119.0 |
| C8—C9—C10 | 120.6 (3) | C108—C109—C110 | 120.1 (3) |
| C8—C9—H91 | 119.5 | C108—C109—H1091 | 121.1 |
| C10—C9—H91 | 119.9 | C110—C109—H1091 | 118.7 |
| C9—C10—C11 | 120.1 (3) | C109—C110—C111 | 120.2 (3) |
| C9—C10—H101 | 119.7 | C109—C110—H1101 | 120.7 |
| C11—C10—H101 | 120.1 | C111—C110—H1101 | 119.1 |
| C6—C11—C10 | 120.0 (3) | C106—C111—C110 | 119.8 (3) |
| C6—C11—H111 | 120.7 | C106—C111—H1111 | 119.4 |
| C10—C11—H111 | 119.3 | C110—C111—H1111 | 120.8 |
| C5—C12—C13 | 119.8 (2) | C105—C112—C113 | 118.8 (2) |
| C5—C12—C17 | 120.8 (2) | C105—C112—C117 | 122.6 (2) |
| C13—C12—C17 | 119.4 (2) | C113—C112—C117 | 118.6 (2) |
| C12—C13—C14 | 120.5 (3) | C112—C113—C114 | 120.9 (3) |
| C12—C13—H131 | 122.2 | C112—C113—H1131 | 119.8 |
| C14—C13—H131 | 117.3 | C114—C113—H1131 | 119.2 |
| C13—C14—C15 | 119.6 (3) | C113—C114—C115 | 119.7 (3) |
| C13—C14—H141 | 119.9 | C113—C114—H1141 | 119.0 |
| C15—C14—H141 | 120.5 | C115—C114—H1141 | 121.2 |
| C14—C15—C16 | 120.3 (3) | C114—C115—C116 | 120.1 (2) |
| C14—C15—H151 | 122.4 | C114—C115—H1151 | 120.3 |
| C16—C15—H151 | 117.4 | C116—C115—H1151 | 119.6 |
| C15—C16—C17 | 120.4 (3) | C115—C116—C117 | 120.2 (2) |
| C15—C16—H161 | 122.9 | C115—C116—H1161 | 118.9 |
| C17—C16—H161 | 116.7 | C117—C116—H1161 | 120.8 |
| C16—C17—C12 | 119.9 (3) | C116—C117—C112 | 120.3 (2) |
| C16—C17—H171 | 120.0 | C116—C117—H1171 | 122.7 |
| C12—C17—H171 | 120.0 | C112—C117—H1171 | 116.9 |
| C3—C18—O19 | 128.2 (3) | C103—C118—O119 | 128.2 (3) |
| C3—C18—O20 | 109.4 (2) | C103—C118—O120 | 109.7 (2) |
| O19—C18—O20 | 122.3 (3) | O119—C118—O120 | 122.0 (3) |
| C18—O20—C21 | 110.2 (2) | C118—O120—C121 | 110.0 (2) |
| C2—C21—O20 | 104.14 (18) | C102—C121—O120 | 104.57 (19) |
| C2—C21—C22 | 113.2 (2) | C102—C121—C122 | 113.7 (2) |
| O20—C21—C22 | 110.3 (2) | O120—C121—C122 | 109.8 (2) |
| C2—C21—H211 | 110.3 | C102—C121—H1211 | 109.4 |
| O20—C21—H211 | 109.0 | O120—C121—H1211 | 107.1 |
| C22—C21—H211 | 109.7 | C122—C121—H1211 | 111.9 |
| C21—C22—O23 | 111.80 (19) | C121—C122—O123 | 111.63 (19) |
| C21—C22—H221 | 108.5 | C121—C122—H1221 | 108.8 |
| O23—C22—H221 | 112.7 | O123—C122—H1221 | 109.1 |
| C21—C22—H222 | 109.5 | C121—C122—H1222 | 108.2 |
| O23—C22—H222 | 105.2 | O123—C122—H1222 | 110.5 |
| H221—C22—H222 | 109.0 | H1221—C122—H1222 | 108.5 |
| C22—O23—C24 | 110.9 (2) | C122—O123—C124 | 110.2 (2) |
| O1—C24—O23 | 110.67 (19) | O101—C124—O123 | 109.8 (2) |
| O1—C24—C25 | 107.49 (18) | O101—C124—C125 | 108.28 (18) |
| O23—C24—C25 | 108.6 (2) | O123—C124—C125 | 109.0 (2) |
| O1—C24—H241 | 109.8 | O101—C124—H1241 | 109.1 |
| O23—C24—H241 | 109.3 | O123—C124—H1241 | 110.5 |
| C25—C24—H241 | 111.0 | C125—C124—H1241 | 110.2 |
| C24—C25—C26 | 119.5 (2) | C124—C125—C126 | 120.9 (2) |
| C24—C25—C30 | 120.7 (2) | C124—C125—C130 | 119.3 (2) |
| C26—C25—C30 | 119.9 (2) | C126—C125—C130 | 119.8 (2) |
| C25—C26—C27 | 120.0 (3) | C125—C126—C127 | 120.2 (3) |
| C25—C26—H261 | 122.5 | C125—C126—H1261 | 119.7 |
| C27—C26—H261 | 117.5 | C127—C126—H1261 | 120.0 |
| C26—C27—C28 | 120.0 (3) | C126—C127—C128 | 120.0 (3) |
| C26—C27—H271 | 120.1 | C126—C127—H1271 | 119.9 |
| C28—C27—H271 | 119.9 | C128—C127—H1271 | 120.0 |
| C27—C28—C29 | 120.0 (3) | C127—C128—C129 | 120.1 (3) |
| C27—C28—H281 | 119.3 | C127—C128—H1281 | 119.0 |
| C29—C28—H281 | 120.7 | C129—C128—H1281 | 121.0 |
| C28—C29—C30 | 120.3 (3) | C128—C129—C130 | 120.0 (3) |
| C28—C29—H291 | 120.5 | C128—C129—H1291 | 119.4 |
| C30—C29—H291 | 119.2 | C130—C129—H1291 | 120.7 |
| C29—C30—C25 | 119.8 (3) | C129—C130—C125 | 119.9 (3) |
| C29—C30—H301 | 118.6 | C129—C130—H1301 | 120.3 |
| C25—C30—H301 | 121.6 | C125—C130—H1301 | 119.8 |
| D—H···A | D—H | H···A | D···A | D—H···A |
| C8—H81···O19i | 0.95 | 2.57 | 3.520 (4) | 173 |
| C14—H141···O119ii | 0.95 | 2.55 | 3.309 (4) | 137 |
| C28—H281···O19iii | 0.96 | 2.57 | 3.225 (4) | 126 |
| Symmetry codes: (i) x, y+1, z; (ii) x, y, z−1; (iii) −x+1, y+1/2, −z+1. |
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Carbohydrates provide excellent starting materials for the synthesis of small chiral molecules (Collins & Ferrier, 1995). They are relatively inexpensive and provide an almost boundless pool of chiral building blocks (Draths et al., 1992). Much of their synthetic utility is however dependent on developing successful protecting group strategies.
Diazodiphenylmethane has been found to be a useful protecting group in the synthesis of methyl 2,3,6-tri-O-methyl-α-D-glucopyranoside and kojibiose octa-acetate (Jackson et al., 1982); monoalkylations of vicinal diols have been achieved with this reagent and other diaryldiazoalkanes with high regioselectivities (Petursson & Webber, 1982; Petursson et al., 2007; Petursson, 2003; Petursson, 2001). This is of particular interest for the protection of base sensitive sugar lactones as the reaction is carried out under neutral conditions (Best et al. 2008; Jenkinson et al. 2008).
The utility of the benzhydryl group as a protecting group in carbohydrate chemistry has here been demonstrated with the reaction of 3,5-O-benzylidene-D-xylono-1,4-lactone 1 with diphenyldiazomethane (Fig. 1). No epimerization at C2 was observed (Fig. 2).
Unlike the analogously protected lyxono lactone (Jenkinson et al., 2008), the asymmetric unit of the isomeric xylono lactone contains two crystallographically distinct molecules which are related by a pseudo 2-fold axis of symmetry. These are similar in geometry with the exception of two of the phenyl rings which sit at approximately 90° to each other (Fig. 3). When the core 20 atoms, of the carbohydrate backbone and 1 phenyl group, are mapped there is good overlap- r.m.s. deviations: posn 0.1139 Å, bond 0.0104 Å, torsion 2.5205°.
The crystal packing shows alternating layers of molecules in the ac plane (Fig. 4). The 5-ring lactones adopt envelope conformations with C2 or C102 out of the plane. The 6-ring ketals adopt chair conformations. There is no classic hydrogen-bonding.