Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807042754/ci2449sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807042754/ci2449Isup2.hkl |
CCDC reference: 663718
To a solution of (1S,4R)-1-isocyanato-7,7-dimethylbicyclo[2.2.1]heptan-2-one (0.9 g, 5 mmol) in tetrahydrofuran (10 ml) was added a 1 N aqueous HCl solution (15 ml), and the mixture was stirred at reflux for 1 h. 2 N aqueous sodium hydroxide (10 ml) was then added at room temperature and stirred for 30 min. Then the solution was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous MgSO4, concentrated under vacuum and the crude product was purified by column chromatography (petroleum ether-ethyl acetate, 6:1) to give the title compound as a white solid (0.06 g). Single crystals of (I) were obtained by slow evaporation of a petroleum ether-ethyl acetate solution (6:1 v/v).
N-bound H atoms were located in a difference map and refined isotropically. Methyl H atoms were placed in calculated positions, with C—H = 0.97 Å and Uiso(H) = 1.5Ueq(C). Other H atoms were placed in idealized positions [C—H = 0.98 Å (methine) and 0.97 Å (methylene)] and refined in riding mode, with Uiso(H) = 1.2Ueq(C). In the absence of significant anomalous scattering effects, Friedel pairs were merged; the absolute configuration of (I) was assigned assuming that the absolute configuration of the starting material was retained during the synthesis.
The title compound, (I), is a byproduct in the synthesis of (1S,4R)-1-amino-7,7-dimethylbicyclo[2.2.1]heptan-2-one, which is used in the synthesis of several optically active nitroxyl radicals as a key synthetic intermediate (Braslau et al., 1996). The molecular structure of (I) is shown in Fig. 1. Bond lengths and angles in the camphor moiety are in agreement with the values reported for a related compound (Gao et al., 2006). Both N—H groups are involved in hydrogen-bonding interactions with the carbonyl O atom of a neighboring molecule (Table 1). Molecules are linked into chains, running along the a axis, by N—H···O intermolecular hydrogen bonds.
For related literature, see: Braslau et al. (1996); Gao et al. (2006).
Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 1997).
Fig. 1. The molecular structure of (I), shown with 50% probability displacement ellipsoids (arbitrary spheres for H atoms). |
C19H28N2O3 | F(000) = 720 |
Mr = 332.43 | Dx = 1.269 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 5524 reflections |
a = 6.7578 (16) Å | θ = 2.6–28.3° |
b = 12.107 (3) Å | µ = 0.09 mm−1 |
c = 21.269 (5) Å | T = 223 K |
V = 1740.2 (7) Å3 | Needle, colourless |
Z = 4 | 0.50 × 0.16 × 0.12 mm |
Bruker APEX area-detector diffractometer | 2418 independent reflections |
Radiation source: fine-focus sealed tube | 2280 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.022 |
φ and ω scan | θmax = 28.5°, θmin = 1.9° |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | h = −8→9 |
Tmin = 0.958, Tmax = 0.990 | k = −16→13 |
10699 measured reflections | l = −27→27 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.045 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.115 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.11 | w = 1/[σ2(Fo2) + (0.0653P)2 + 0.3373P] where P = (Fo2 + 2Fc2)/3 |
2418 reflections | (Δ/σ)max = 0.001 |
225 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.30 e Å−3 |
C19H28N2O3 | V = 1740.2 (7) Å3 |
Mr = 332.43 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 6.7578 (16) Å | µ = 0.09 mm−1 |
b = 12.107 (3) Å | T = 223 K |
c = 21.269 (5) Å | 0.50 × 0.16 × 0.12 mm |
Bruker APEX area-detector diffractometer | 2418 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | 2280 reflections with I > 2σ(I) |
Tmin = 0.958, Tmax = 0.990 | Rint = 0.022 |
10699 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.115 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.11 | Δρmax = 0.25 e Å−3 |
2418 reflections | Δρmin = −0.30 e Å−3 |
225 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.0794 (2) | −0.00170 (12) | 0.15120 (6) | 0.0362 (4) | |
O2 | −0.3852 (3) | 0.30420 (16) | 0.17297 (8) | 0.0575 (6) | |
O3 | 0.2716 (3) | 0.22757 (12) | −0.02375 (7) | 0.0389 (4) | |
N1 | −0.1005 (3) | 0.15462 (15) | 0.14606 (7) | 0.0303 (4) | |
N2 | 0.0777 (3) | 0.09851 (14) | 0.06177 (7) | 0.0265 (3) | |
C1 | −0.1793 (3) | 0.15398 (16) | 0.20795 (8) | 0.0259 (4) | |
C2 | −0.3036 (3) | 0.05390 (18) | 0.22789 (9) | 0.0326 (4) | |
H2A | −0.4341 | 0.0552 | 0.2078 | 0.039* | |
H2B | −0.2369 | −0.0154 | 0.2171 | 0.039* | |
C3 | −0.3212 (4) | 0.0676 (2) | 0.29920 (9) | 0.0411 (5) | |
H3A | −0.4602 | 0.0699 | 0.3124 | 0.049* | |
H3B | −0.2542 | 0.0073 | 0.3214 | 0.049* | |
C4 | −0.2196 (4) | 0.1770 (2) | 0.31125 (9) | 0.0379 (5) | |
H4A | −0.1817 | 0.1891 | 0.3557 | 0.045* | |
C5 | −0.3502 (4) | 0.2668 (2) | 0.28422 (11) | 0.0490 (7) | |
H5A | −0.4892 | 0.2558 | 0.2958 | 0.059* | |
H5B | −0.3074 | 0.3402 | 0.2979 | 0.059* | |
C6 | −0.3187 (4) | 0.25094 (19) | 0.21497 (10) | 0.0380 (5) | |
C7 | −0.0432 (3) | 0.17393 (16) | 0.26539 (9) | 0.0296 (4) | |
C8 | 0.1014 (3) | 0.08364 (18) | 0.28097 (10) | 0.0349 (5) | |
H8A | 0.1785 | 0.1049 | 0.3175 | 0.052* | |
H8B | 0.1891 | 0.0718 | 0.2455 | 0.052* | |
H8C | 0.0298 | 0.0160 | 0.2900 | 0.052* | |
C9 | 0.0710 (4) | 0.2801 (2) | 0.26036 (14) | 0.0504 (6) | |
H9A | 0.1540 | 0.2889 | 0.2972 | 0.076* | |
H9B | −0.0206 | 0.3416 | 0.2576 | 0.076* | |
H9C | 0.1532 | 0.2784 | 0.2230 | 0.076* | |
C10 | 0.2530 (3) | 0.05642 (15) | 0.03347 (7) | 0.0227 (4) | |
C11 | 0.3229 (3) | 0.13360 (16) | −0.01740 (9) | 0.0292 (4) | |
C12 | 0.4655 (4) | 0.07015 (19) | −0.05723 (10) | 0.0390 (5) | |
H12A | 0.5976 | 0.1036 | −0.0565 | 0.047* | |
H12B | 0.4197 | 0.0649 | −0.1008 | 0.047* | |
C13 | 0.4647 (3) | −0.04173 (19) | −0.02532 (10) | 0.0351 (5) | |
H13A | 0.5125 | −0.1033 | −0.0519 | 0.042* | |
C14 | 0.5779 (4) | −0.0266 (2) | 0.03588 (11) | 0.0457 (6) | |
H14A | 0.7046 | 0.0107 | 0.0287 | 0.055* | |
H14B | 0.6024 | −0.0978 | 0.0564 | 0.055* | |
C15 | 0.4387 (3) | 0.0450 (2) | 0.07487 (9) | 0.0341 (5) | |
H15A | 0.4978 | 0.1174 | 0.0834 | 0.041* | |
H15B | 0.4067 | 0.0092 | 0.1149 | 0.041* | |
C16 | 0.2486 (3) | −0.05347 (16) | −0.00295 (8) | 0.0279 (4) | |
C17 | 0.0970 (4) | −0.0538 (2) | −0.05517 (10) | 0.0407 (5) | |
H17A | −0.0344 | −0.0616 | −0.0373 | 0.061* | |
H17B | 0.1231 | −0.1150 | −0.0834 | 0.061* | |
H17C | 0.1049 | 0.0151 | −0.0783 | 0.061* | |
C18 | 0.2141 (4) | −0.15394 (18) | 0.03774 (11) | 0.0422 (5) | |
H18A | 0.0760 | −0.1569 | 0.0501 | 0.063* | |
H18B | 0.2966 | −0.1494 | 0.0750 | 0.063* | |
H18C | 0.2474 | −0.2200 | 0.0142 | 0.063* | |
C19 | 0.0236 (3) | 0.07774 (15) | 0.12232 (8) | 0.0252 (4) | |
H1 | −0.146 (4) | 0.202 (2) | 0.1226 (11) | 0.027 (6)* | |
H2 | 0.038 (3) | 0.1590 (19) | 0.0484 (10) | 0.023 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0492 (9) | 0.0318 (7) | 0.0276 (6) | 0.0136 (7) | 0.0129 (7) | 0.0098 (6) |
O2 | 0.0700 (13) | 0.0620 (11) | 0.0403 (8) | 0.0400 (10) | −0.0001 (9) | 0.0061 (8) |
O3 | 0.0514 (10) | 0.0307 (7) | 0.0345 (7) | −0.0025 (7) | 0.0111 (7) | 0.0075 (6) |
N1 | 0.0371 (9) | 0.0327 (8) | 0.0211 (7) | 0.0111 (8) | 0.0058 (7) | 0.0083 (6) |
N2 | 0.0298 (8) | 0.0286 (8) | 0.0210 (7) | 0.0054 (7) | 0.0048 (6) | 0.0060 (6) |
C1 | 0.0281 (9) | 0.0299 (9) | 0.0198 (8) | 0.0049 (8) | 0.0015 (7) | 0.0000 (7) |
C2 | 0.0309 (10) | 0.0426 (11) | 0.0244 (8) | −0.0071 (9) | 0.0005 (8) | 0.0015 (8) |
C3 | 0.0352 (11) | 0.0636 (15) | 0.0244 (9) | −0.0032 (11) | 0.0058 (8) | 0.0047 (10) |
C4 | 0.0386 (12) | 0.0514 (13) | 0.0236 (9) | 0.0113 (11) | 0.0003 (8) | −0.0084 (8) |
C5 | 0.0487 (14) | 0.0646 (16) | 0.0338 (11) | 0.0264 (13) | 0.0004 (10) | −0.0122 (11) |
C6 | 0.0371 (11) | 0.0437 (12) | 0.0331 (10) | 0.0151 (10) | 0.0017 (9) | −0.0020 (9) |
C7 | 0.0290 (9) | 0.0309 (9) | 0.0289 (8) | 0.0028 (8) | −0.0023 (8) | −0.0048 (7) |
C8 | 0.0326 (10) | 0.0398 (11) | 0.0323 (10) | 0.0059 (9) | −0.0071 (8) | −0.0014 (8) |
C9 | 0.0512 (15) | 0.0341 (11) | 0.0660 (15) | −0.0066 (11) | −0.0081 (14) | −0.0043 (11) |
C10 | 0.0251 (9) | 0.0254 (8) | 0.0176 (7) | −0.0009 (7) | 0.0022 (6) | 0.0000 (7) |
C11 | 0.0315 (10) | 0.0334 (10) | 0.0225 (8) | −0.0056 (8) | 0.0039 (8) | 0.0006 (7) |
C12 | 0.0418 (12) | 0.0433 (12) | 0.0319 (10) | −0.0048 (10) | 0.0153 (9) | −0.0026 (9) |
C13 | 0.0353 (11) | 0.0379 (11) | 0.0320 (9) | 0.0035 (9) | 0.0088 (9) | −0.0055 (9) |
C14 | 0.0308 (12) | 0.0624 (15) | 0.0440 (12) | 0.0094 (11) | −0.0011 (10) | −0.0046 (11) |
C15 | 0.0281 (10) | 0.0473 (12) | 0.0268 (9) | −0.0006 (9) | −0.0044 (8) | −0.0037 (9) |
C16 | 0.0332 (10) | 0.0279 (9) | 0.0226 (8) | −0.0012 (8) | 0.0052 (8) | −0.0039 (7) |
C17 | 0.0430 (12) | 0.0502 (13) | 0.0288 (10) | −0.0092 (11) | −0.0021 (9) | −0.0085 (9) |
C18 | 0.0580 (15) | 0.0269 (10) | 0.0417 (11) | 0.0003 (10) | 0.0093 (11) | −0.0006 (9) |
C19 | 0.0289 (9) | 0.0272 (9) | 0.0196 (7) | −0.0001 (8) | 0.0036 (7) | 0.0006 (6) |
O1—C19 | 1.202 (2) | C8—H8C | 0.97 |
O2—C6 | 1.190 (3) | C9—H9A | 0.97 |
O3—C11 | 1.197 (3) | C9—H9B | 0.97 |
N1—C19 | 1.351 (2) | C9—H9C | 0.97 |
N1—C1 | 1.420 (2) | C10—C11 | 1.506 (3) |
N1—H1 | 0.82 (3) | C10—C15 | 1.539 (3) |
N2—C19 | 1.362 (2) | C10—C16 | 1.540 (2) |
N2—C10 | 1.423 (2) | C11—C12 | 1.495 (3) |
N2—H2 | 0.83 (2) | C12—C13 | 1.515 (3) |
C1—C6 | 1.513 (3) | C12—H12A | 0.98 |
C1—C2 | 1.534 (3) | C12—H12B | 0.98 |
C1—C7 | 1.548 (3) | C13—C14 | 1.521 (3) |
C2—C3 | 1.530 (3) | C13—C16 | 1.543 (3) |
C2—H2A | 0.98 | C13—H13A | 0.99 |
C2—H2B | 0.98 | C14—C15 | 1.525 (3) |
C3—C4 | 1.514 (3) | C14—H14A | 0.98 |
C3—H3A | 0.98 | C14—H14B | 0.98 |
C3—H3B | 0.98 | C15—H15A | 0.98 |
C4—C5 | 1.513 (3) | C15—H15B | 0.98 |
C4—C7 | 1.541 (3) | C16—C17 | 1.511 (3) |
C4—H4A | 0.99 | C16—C18 | 1.511 (3) |
C5—C6 | 1.500 (3) | C17—H17A | 0.97 |
C5—H5A | 0.98 | C17—H17B | 0.97 |
C5—H5B | 0.98 | C17—H17C | 0.97 |
C7—C8 | 1.503 (3) | C18—H18A | 0.97 |
C7—C9 | 1.504 (3) | C18—H18B | 0.97 |
C8—H8A | 0.97 | C18—H18C | 0.97 |
C8—H8B | 0.97 | ||
C19—N1—C1 | 125.14 (16) | H9B—C9—H9C | 109.5 |
C19—N1—H1 | 119.3 (16) | N2—C10—C11 | 110.05 (16) |
C1—N1—H1 | 115.1 (16) | N2—C10—C15 | 117.95 (14) |
C19—N2—C10 | 123.87 (16) | C11—C10—C15 | 102.19 (16) |
C19—N2—H2 | 113.6 (15) | N2—C10—C16 | 120.39 (16) |
C10—N2—H2 | 116.0 (16) | C11—C10—C16 | 100.42 (14) |
N1—C1—C6 | 108.71 (16) | C15—C10—C16 | 103.08 (15) |
N1—C1—C2 | 117.77 (16) | O3—C11—C12 | 127.66 (19) |
C6—C1—C2 | 104.15 (17) | O3—C11—C10 | 125.45 (19) |
N1—C1—C7 | 120.53 (18) | C12—C11—C10 | 106.89 (17) |
C6—C1—C7 | 99.85 (15) | C11—C12—C13 | 101.71 (16) |
C2—C1—C7 | 103.32 (15) | C11—C12—H12A | 111.4 |
C3—C2—C1 | 103.36 (17) | C13—C12—H12A | 111.4 |
C3—C2—H2A | 111.1 | C11—C12—H12B | 111.4 |
C1—C2—H2A | 111.1 | C13—C12—H12B | 111.4 |
C3—C2—H2B | 111.1 | H12A—C12—H12B | 109.3 |
C1—C2—H2B | 111.1 | C12—C13—C14 | 105.91 (19) |
H2A—C2—H2B | 109.1 | C12—C13—C16 | 102.95 (18) |
C4—C3—C2 | 103.12 (18) | C14—C13—C16 | 102.90 (17) |
C4—C3—H3A | 111.1 | C12—C13—H13A | 114.6 |
C2—C3—H3A | 111.1 | C14—C13—H13A | 114.6 |
C4—C3—H3B | 111.1 | C16—C13—H13A | 114.6 |
C2—C3—H3B | 111.1 | C13—C14—C15 | 102.93 (18) |
H3A—C3—H3B | 109.1 | C13—C14—H14A | 111.2 |
C5—C4—C3 | 107.4 (2) | C15—C14—H14A | 111.2 |
C5—C4—C7 | 103.20 (18) | C13—C14—H14B | 111.2 |
C3—C4—C7 | 102.86 (16) | C15—C14—H14B | 111.2 |
C5—C4—H4A | 114.1 | H14A—C14—H14B | 109.1 |
C3—C4—H4A | 114.1 | C14—C15—C10 | 104.04 (16) |
C7—C4—H4A | 114.1 | C14—C15—H15A | 110.9 |
C6—C5—C4 | 101.45 (18) | C10—C15—H15A | 110.9 |
C6—C5—H5A | 111.5 | C14—C15—H15B | 110.9 |
C4—C5—H5A | 111.5 | C10—C15—H15B | 110.9 |
C6—C5—H5B | 111.5 | H15A—C15—H15B | 109.0 |
C4—C5—H5B | 111.5 | C17—C16—C18 | 108.32 (18) |
H5A—C5—H5B | 109.3 | C17—C16—C10 | 112.65 (17) |
O2—C6—C5 | 127.9 (2) | C18—C16—C10 | 114.24 (15) |
O2—C6—C1 | 125.57 (19) | C17—C16—C13 | 114.54 (16) |
C5—C6—C1 | 106.52 (18) | C18—C16—C13 | 113.39 (19) |
C8—C7—C9 | 107.70 (19) | C10—C16—C13 | 93.27 (15) |
C8—C7—C4 | 112.41 (17) | C16—C17—H17A | 109.5 |
C9—C7—C4 | 114.92 (19) | C16—C17—H17B | 109.5 |
C8—C7—C1 | 116.53 (16) | H17A—C17—H17B | 109.5 |
C9—C7—C1 | 112.47 (18) | C16—C17—H17C | 109.5 |
C4—C7—C1 | 92.50 (16) | H17A—C17—H17C | 109.5 |
C7—C8—H8A | 109.5 | H17B—C17—H17C | 109.5 |
C7—C8—H8B | 109.5 | C16—C18—H18A | 109.5 |
H8A—C8—H8B | 109.5 | C16—C18—H18B | 109.5 |
C7—C8—H8C | 109.5 | H18A—C18—H18B | 109.5 |
H8A—C8—H8C | 109.5 | C16—C18—H18C | 109.5 |
H8B—C8—H8C | 109.5 | H18A—C18—H18C | 109.5 |
C7—C9—H9A | 109.5 | H18B—C18—H18C | 109.5 |
C7—C9—H9B | 109.5 | O1—C19—N1 | 123.73 (17) |
H9A—C9—H9B | 109.5 | O1—C19—N2 | 123.13 (18) |
C7—C9—H9C | 109.5 | N1—C19—N2 | 113.13 (17) |
H9A—C9—H9C | 109.5 | ||
C19—N1—C1—C6 | −177.4 (2) | C19—N2—C10—C16 | 92.3 (2) |
C19—N1—C1—C2 | −59.3 (3) | N2—C10—C11—O3 | 16.8 (3) |
C19—N1—C1—C7 | 68.4 (3) | C15—C10—C11—O3 | −109.3 (2) |
N1—C1—C2—C3 | 167.25 (19) | C16—C10—C11—O3 | 144.7 (2) |
C6—C1—C2—C3 | −72.3 (2) | N2—C10—C11—C12 | −163.16 (16) |
C7—C1—C2—C3 | 31.6 (2) | C15—C10—C11—C12 | 70.73 (19) |
C1—C2—C3—C4 | 4.1 (2) | C16—C10—C11—C12 | −35.2 (2) |
C2—C3—C4—C5 | 69.8 (2) | O3—C11—C12—C13 | −179.5 (2) |
C2—C3—C4—C7 | −38.7 (2) | C10—C11—C12—C13 | 0.4 (2) |
C3—C4—C5—C6 | −73.0 (2) | C11—C12—C13—C14 | −72.8 (2) |
C7—C4—C5—C6 | 35.2 (3) | C11—C12—C13—C16 | 34.9 (2) |
C4—C5—C6—O2 | −177.4 (3) | C12—C13—C14—C15 | 69.8 (2) |
C4—C5—C6—C1 | 1.2 (3) | C16—C13—C14—C15 | −37.9 (2) |
N1—C1—C6—O2 | 15.0 (3) | C13—C14—C15—C10 | 4.0 (2) |
C2—C1—C6—O2 | −111.3 (3) | N2—C10—C15—C14 | 166.56 (18) |
C7—C1—C6—O2 | 142.1 (3) | C11—C10—C15—C14 | −72.7 (2) |
N1—C1—C6—C5 | −163.6 (2) | C16—C10—C15—C14 | 31.2 (2) |
C2—C1—C6—C5 | 70.0 (2) | N2—C10—C16—C17 | 55.8 (2) |
C7—C1—C6—C5 | −36.5 (2) | C11—C10—C16—C17 | −65.0 (2) |
C5—C4—C7—C8 | −176.07 (19) | C15—C10—C16—C17 | −170.25 (17) |
C3—C4—C7—C8 | −64.4 (2) | N2—C10—C16—C18 | −68.4 (2) |
C5—C4—C7—C9 | 60.3 (2) | C11—C10—C16—C18 | 170.8 (2) |
C3—C4—C7—C9 | 171.92 (19) | C15—C10—C16—C18 | 65.6 (2) |
C5—C4—C7—C1 | −55.97 (19) | N2—C10—C16—C13 | 174.14 (16) |
C3—C4—C7—C1 | 55.68 (18) | C11—C10—C16—C13 | 53.35 (16) |
N1—C1—C7—C8 | −70.1 (2) | C15—C10—C16—C13 | −51.91 (16) |
C6—C1—C7—C8 | 171.19 (18) | C12—C13—C16—C17 | 61.9 (2) |
C2—C1—C7—C8 | 64.0 (2) | C14—C13—C16—C17 | 171.84 (18) |
N1—C1—C7—C9 | 54.9 (3) | C12—C13—C16—C18 | −173.08 (17) |
C6—C1—C7—C9 | −63.8 (2) | C14—C13—C16—C18 | −63.1 (2) |
C2—C1—C7—C9 | −171.00 (18) | C12—C13—C16—C10 | −54.87 (17) |
N1—C1—C7—C4 | 173.26 (19) | C14—C13—C16—C10 | 55.09 (18) |
C6—C1—C7—C4 | 54.55 (17) | C1—N1—C19—O1 | 1.2 (3) |
C2—C1—C7—C4 | −52.67 (17) | C1—N1—C19—N2 | −179.62 (19) |
C19—N2—C10—C11 | −151.76 (18) | C10—N2—C19—O1 | −23.8 (3) |
C19—N2—C10—C15 | −35.1 (3) | C10—N2—C19—N1 | 156.98 (18) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O3i | 0.82 (3) | 2.34 (2) | 3.090 (2) | 153 (2) |
N2—H2···O3i | 0.83 (2) | 2.32 (2) | 3.061 (2) | 148 (2) |
Symmetry code: (i) x−1/2, −y+1/2, −z. |
Experimental details
Crystal data | |
Chemical formula | C19H28N2O3 |
Mr | 332.43 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 223 |
a, b, c (Å) | 6.7578 (16), 12.107 (3), 21.269 (5) |
V (Å3) | 1740.2 (7) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.50 × 0.16 × 0.12 |
Data collection | |
Diffractometer | Bruker APEX area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2001) |
Tmin, Tmax | 0.958, 0.990 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 10699, 2418, 2280 |
Rint | 0.022 |
(sin θ/λ)max (Å−1) | 0.672 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.045, 0.115, 1.11 |
No. of reflections | 2418 |
No. of parameters | 225 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.25, −0.30 |
Computer programs: SMART (Bruker, 2001), SAINT (Bruker, 2001), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), ORTEP-3 for Windows (Farrugia, 1997).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O3i | 0.82 (3) | 2.34 (2) | 3.090 (2) | 153 (2) |
N2—H2···O3i | 0.83 (2) | 2.32 (2) | 3.061 (2) | 148 (2) |
Symmetry code: (i) x−1/2, −y+1/2, −z. |
The title compound, (I), is a byproduct in the synthesis of (1S,4R)-1-amino-7,7-dimethylbicyclo[2.2.1]heptan-2-one, which is used in the synthesis of several optically active nitroxyl radicals as a key synthetic intermediate (Braslau et al., 1996). The molecular structure of (I) is shown in Fig. 1. Bond lengths and angles in the camphor moiety are in agreement with the values reported for a related compound (Gao et al., 2006). Both N—H groups are involved in hydrogen-bonding interactions with the carbonyl O atom of a neighboring molecule (Table 1). Molecules are linked into chains, running along the a axis, by N—H···O intermolecular hydrogen bonds.