Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807029959/wn2148sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807029959/wn2148Isup2.hkl |
CCDC reference: 657665
To a round-bottomed flask charged with 2-aminobenzoic acid (2.74 g, 0.02 mol) dissolved in methanol (20 ml) was slowly added a solution of 1,3-cyclohexadione (2.24 g, 0.02 mol) in 20 ml of methanol. The mixture was refluxed and stirred for 4 h; it was observed that the colour changed from colourless to yellow. The solution was cooled to room temperature and the solvent was removed in vacuum; the yellow solid was washed with diethyl ether. X-ray quality crystals were obtained after slow evaporation of a methanol/water (9:1) solution. Yield 75%. IR (ν/cm-1): 1376 (νC—N). 1H-NMR: (δ): 7.97–7.92 d (C3), 7.4 m (C5, C6), 7.09 t (C4), 2.51–2.48 m (C11), 2.26–2.27 m (C9), 1.95–1.92 m (C10). 13C-NMR (δ): 201. 9 (C12), 170.4 (C1), 165.4 (C8), 141.9 (C7), 134.6 (C3), 133.6 (C5), 125.5 (C6), 124.64 (C4), 122.58 (C2), 100.94 (C13), 37.12 (C11), 31.07 (C9), 22.92 (C10). Elemental analysis(%) for C13H13NO3 found (calc.): C 67.21 (67.52), H 5.43 (5.66), N 5.96 (6.05).
Most H atoms were detected in a Fourier difference map; nevertheless, their positions were subsequently calculated and they were constrained to ride on their parent atoms, with O—H = 0.82 Å, N—H = 0.86 Å, C—H = 0.93 Å for Csp2 and C—H = 0.97Å for methylene. Uiso(H) = xUeq(carrier atom), where x = 1.2 for C, N and 1.5 for O. In the absence of significant anomalous scattering effects, Friedel pairs were merged.
The preparation of the title compound has been reported in the literature in a condensation reaction with isopropylidene malonate (Strozhev & Lielbriedis, 1990). The compound was obtained in 37% yield and no X-ray crystallographic determination has hitherto been performed. A search of the Cambridge Structural Database (Version 5.28; Allen, 2002) yielded no hits.
The title compound crystallizes with two molecules per asymmetric unit. In each molecule the cyclohexene ring adopts a slightly distorted envelope conformation, with C9 and C9' as flap atoms. The bond distances C1—N, N—C7, C7═C12, C12—C11, C1'—N,' N'—C7', C7'═C12' and C12'—C11' (Table 1 and Fig. 1) clearly indicate that the enamine tautomer is present in the crystal structure, rather than the imine normally expected from a Schiff base reaction. The C—N—C bond angles, 131.6 (3)° and 130.7 (3)°, are typical of Nsp3.
The X-ray crystallographic determination has revealed that the title compound exists in the solid state in a pseudo-polymeric arrangement, held together by intermolecular O—H···O hydrogen bonds. These connect carboxyl and C═O groups of neighbouring molecules.
For related literature, see: Allen (2002); Strozhev & Lielbriedis (1990).
Data collection: XSCANS (Siemens, 1991); cell refinement: XSCANS; data reduction: XSCANS; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL/PC (Sheldrick, 1990); software used to prepare material for publication: SHELXL97.
Fig. 1. Molecular structure of the title compound, showing the atom-numbering scheme and the intermolecular hydrogen bond (dashed line) Displacement ellipsoids are drawn at the 50% probability level. |
C13H13NO3 | Dx = 1.345 Mg m−3 |
Mr = 231.24 | Melting point = 183.7–185.5 K |
Orthorhombic, Pna21 | Mo Kα radiation, λ = 0.71073 Å |
a = 11.3867 (11) Å | Cell parameters from 38 reflections |
b = 13.0719 (9) Å | θ = 4.8–12.5° |
c = 15.3389 (14) Å | µ = 0.10 mm−1 |
V = 2283.2 (3) Å3 | T = 293 K |
Z = 8 | Prismatic, colorless |
F(000) = 976 | 0.2 × 0.2 × 0.2 mm |
Siemens P4 diffractometer | Rint = 0.015 |
Radiation source: fine-focus sealed tube | θmax = 25.5°, θmin = 2.1° |
Graphite monochromator | h = −1→13 |
ω / 2θ scans | k = −3→15 |
2549 measured reflections | l = −4→18 |
2266 independent reflections | 3 standard reflections every 247 reflections |
1800 reflections with I > 2σ(I) | intensity decay: 4% |
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)] = 0.046 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.132 | H-atom parameters constrained |
S = 0.93 | w = 1/[σ2(Fo2) + (0.1P)2] where P = (Fo2 + 2Fc2)/3 |
2266 reflections | (Δ/σ)max = 0.018 |
307 parameters | Δρmax = 0.18 e Å−3 |
1 restraint | Δρmin = −0.25 e Å−3 |
C13H13NO3 | V = 2283.2 (3) Å3 |
Mr = 231.24 | Z = 8 |
Orthorhombic, Pna21 | Mo Kα radiation |
a = 11.3867 (11) Å | µ = 0.10 mm−1 |
b = 13.0719 (9) Å | T = 293 K |
c = 15.3389 (14) Å | 0.2 × 0.2 × 0.2 mm |
Siemens P4 diffractometer | Rint = 0.015 |
2549 measured reflections | 3 standard reflections every 247 reflections |
2266 independent reflections | intensity decay: 4% |
1800 reflections with I > 2σ(I) |
R[F2 > 2σ(F2)] = 0.046 | 1 restraint |
wR(F2) = 0.132 | H-atom parameters constrained |
S = 0.93 | Δρmax = 0.18 e Å−3 |
2266 reflections | Δρmin = −0.25 e Å−3 |
307 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 | 0.5835 (3) | 0.4550 (2) | 0.7105 (2) | 0.0678 (9) | |
O2 | 0.4210 (2) | 0.4172 (2) | 0.7836 (2) | 0.0644 (9) | |
H2O | 0.4113 | 0.4792 | 0.7804 | 0.097* | |
C13 | 0.5183 (3) | 0.3924 (3) | 0.7441 (3) | 0.0452 (9) | |
C6 | 0.5421 (3) | 0.2797 (3) | 0.7469 (2) | 0.0402 (8) | |
C5 | 0.4676 (3) | 0.2177 (3) | 0.7959 (3) | 0.0465 (9) | |
H5 | 0.4034 | 0.2471 | 0.8238 | 0.056* | |
C4 | 0.4865 (3) | 0.1147 (3) | 0.8043 (3) | 0.0502 (10) | |
H4 | 0.4359 | 0.0743 | 0.8373 | 0.060* | |
C3 | 0.5822 (3) | 0.0721 (3) | 0.7627 (3) | 0.0499 (10) | |
H3 | 0.5964 | 0.0024 | 0.7688 | 0.060* | |
C2 | 0.6568 (3) | 0.1297 (3) | 0.7128 (2) | 0.0426 (8) | |
H2 | 0.7204 | 0.0990 | 0.6852 | 0.051* | |
C1 | 0.6372 (3) | 0.2350 (3) | 0.7033 (2) | 0.0376 (8) | |
N | 0.7126 (3) | 0.2982 (2) | 0.6544 (2) | 0.0455 (8) | |
H1 | 0.7075 | 0.3621 | 0.6671 | 0.055* | |
C7 | 0.7918 (3) | 0.2764 (3) | 0.5909 (2) | 0.0403 (8) | |
C8 | 0.8719 (3) | 0.3646 (3) | 0.5703 (3) | 0.0443 (9) | |
H8A | 0.9332 | 0.3678 | 0.6142 | 0.053* | |
H8B | 0.8273 | 0.4277 | 0.5736 | 0.053* | |
C9 | 0.9286 (4) | 0.3574 (3) | 0.4812 (3) | 0.0530 (11) | |
H9A | 0.9899 | 0.4086 | 0.4760 | 0.064* | |
H9B | 0.8704 | 0.3704 | 0.4364 | 0.064* | |
C10 | 0.9808 (4) | 0.2511 (3) | 0.4687 (3) | 0.0519 (11) | |
H10A | 1.0105 | 0.2450 | 0.4096 | 0.062* | |
H10B | 1.0464 | 0.2424 | 0.5083 | 0.062* | |
C11 | 0.8926 (3) | 0.1686 (3) | 0.4848 (3) | 0.0394 (8) | |
C12 | 0.8009 (3) | 0.1860 (3) | 0.5470 (3) | 0.0400 (8) | |
H12 | 0.7463 | 0.1346 | 0.5577 | 0.048* | |
O3 | 0.9019 (2) | 0.08747 (19) | 0.4442 (2) | 0.0554 (7) | |
O1' | 0.6639 (3) | 0.9504 (2) | 0.5383 (2) | 0.0723 (10) | |
O2' | 0.8124 (2) | 0.9080 (2) | 0.4533 (2) | 0.0649 (9) | |
H2O' | 0.8278 | 0.9690 | 0.4585 | 0.097* | |
C13' | 0.7225 (3) | 0.8857 (3) | 0.5014 (3) | 0.0429 (9) | |
C6' | 0.6979 (3) | 0.7738 (3) | 0.5042 (2) | 0.0382 (8) | |
C5' | 0.7693 (3) | 0.7071 (3) | 0.4574 (2) | 0.0453 (9) | |
H5' | 0.8350 | 0.7327 | 0.4288 | 0.054* | |
C4' | 0.7451 (3) | 0.6040 (3) | 0.4525 (3) | 0.0484 (9) | |
H4' | 0.7951 | 0.5602 | 0.4223 | 0.058* | |
C3' | 0.6461 (4) | 0.5666 (3) | 0.4926 (3) | 0.0505 (10) | |
H3' | 0.6276 | 0.4976 | 0.4874 | 0.061* | |
C2' | 0.5738 (3) | 0.6299 (3) | 0.5405 (3) | 0.0483 (10) | |
H2' | 0.5075 | 0.6029 | 0.5675 | 0.058* | |
C1' | 0.5988 (3) | 0.7339 (3) | 0.5491 (3) | 0.0393 (8) | |
N' | 0.5268 (2) | 0.8004 (2) | 0.5962 (2) | 0.0455 (8) | |
H1' | 0.5340 | 0.8638 | 0.5824 | 0.055* | |
C7' | 0.4468 (3) | 0.7814 (3) | 0.6606 (2) | 0.0382 (8) | |
C8' | 0.3695 (3) | 0.8713 (3) | 0.6803 (3) | 0.0442 (9) | |
H8'A | 0.3073 | 0.8746 | 0.6372 | 0.053* | |
H8'B | 0.4155 | 0.9336 | 0.6755 | 0.053* | |
C9' | 0.3153 (4) | 0.8663 (3) | 0.7703 (3) | 0.0522 (10) | |
H9'A | 0.2570 | 0.9199 | 0.7766 | 0.063* | |
H9'B | 0.3754 | 0.8766 | 0.8142 | 0.063* | |
C10' | 0.2581 (3) | 0.7627 (3) | 0.7830 (3) | 0.0554 (12) | |
H10C | 0.2285 | 0.7577 | 0.8421 | 0.066* | |
H10D | 0.1918 | 0.7566 | 0.7436 | 0.066* | |
C11' | 0.3422 (3) | 0.6767 (3) | 0.7664 (2) | 0.0408 (8) | |
C12' | 0.4342 (3) | 0.6921 (3) | 0.7048 (3) | 0.0414 (8) | |
H12' | 0.4872 | 0.6393 | 0.6946 | 0.050* | |
O3' | 0.3271 (2) | 0.5937 (2) | 0.8042 (2) | 0.0561 (8) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0716 (18) | 0.0402 (15) | 0.092 (2) | 0.0011 (13) | 0.0372 (18) | 0.0043 (16) |
O2 | 0.0588 (17) | 0.0435 (16) | 0.091 (2) | 0.0050 (13) | 0.0285 (17) | −0.0018 (16) |
C13 | 0.0461 (19) | 0.045 (2) | 0.045 (2) | 0.0024 (17) | 0.0071 (18) | −0.0055 (18) |
C6 | 0.0461 (19) | 0.0359 (18) | 0.038 (2) | −0.0023 (17) | −0.0044 (17) | −0.0062 (17) |
C5 | 0.049 (2) | 0.041 (2) | 0.049 (2) | −0.0028 (17) | 0.0085 (19) | 0.0007 (18) |
C4 | 0.060 (2) | 0.044 (2) | 0.046 (2) | −0.0035 (18) | 0.008 (2) | 0.0064 (18) |
C3 | 0.063 (2) | 0.0385 (19) | 0.048 (2) | 0.0012 (17) | −0.007 (2) | 0.0031 (18) |
C2 | 0.0444 (19) | 0.0402 (19) | 0.043 (2) | 0.0068 (15) | −0.0017 (17) | −0.0013 (17) |
C1 | 0.0384 (17) | 0.0371 (17) | 0.037 (2) | −0.0025 (14) | −0.0024 (17) | −0.0030 (16) |
N | 0.0464 (17) | 0.0346 (15) | 0.0555 (19) | −0.0008 (13) | 0.0066 (15) | −0.0099 (15) |
C7 | 0.0339 (17) | 0.0378 (17) | 0.049 (2) | −0.0029 (14) | −0.0030 (16) | −0.0041 (18) |
C8 | 0.0448 (19) | 0.0363 (18) | 0.052 (2) | −0.0058 (15) | −0.0018 (17) | −0.0042 (17) |
C9 | 0.065 (2) | 0.042 (2) | 0.052 (3) | −0.0191 (19) | 0.008 (2) | −0.0043 (19) |
C10 | 0.049 (2) | 0.047 (2) | 0.059 (3) | −0.0076 (18) | 0.015 (2) | −0.0035 (19) |
C11 | 0.0401 (17) | 0.0319 (18) | 0.046 (2) | −0.0004 (14) | 0.0026 (16) | 0.0001 (16) |
C12 | 0.0359 (16) | 0.0380 (17) | 0.046 (2) | −0.0066 (14) | 0.0041 (17) | 0.0014 (17) |
O3 | 0.0650 (17) | 0.0355 (14) | 0.0656 (18) | 0.0000 (12) | 0.0215 (15) | −0.0052 (14) |
O1' | 0.0770 (19) | 0.0384 (15) | 0.101 (3) | −0.0051 (14) | 0.037 (2) | −0.0025 (17) |
O2' | 0.0670 (18) | 0.0403 (15) | 0.087 (2) | −0.0120 (13) | 0.0299 (18) | −0.0014 (15) |
C13' | 0.0424 (19) | 0.041 (2) | 0.045 (2) | 0.0014 (16) | 0.0018 (18) | 0.0038 (17) |
C6' | 0.0377 (17) | 0.0398 (18) | 0.037 (2) | 0.0003 (15) | −0.0006 (16) | 0.0032 (17) |
C5' | 0.049 (2) | 0.048 (2) | 0.038 (2) | −0.0001 (17) | 0.0035 (18) | 0.0046 (17) |
C4' | 0.063 (2) | 0.0412 (18) | 0.041 (2) | 0.0035 (17) | 0.004 (2) | −0.0007 (17) |
C3' | 0.066 (2) | 0.0405 (19) | 0.045 (2) | −0.0042 (17) | −0.001 (2) | −0.0029 (18) |
C2' | 0.046 (2) | 0.049 (2) | 0.050 (2) | −0.0092 (16) | 0.0038 (18) | 0.001 (2) |
C1' | 0.0395 (17) | 0.0369 (17) | 0.041 (2) | −0.0013 (14) | −0.0009 (18) | 0.0038 (17) |
N' | 0.0452 (16) | 0.0347 (15) | 0.057 (2) | 0.0013 (13) | 0.0130 (16) | 0.0070 (14) |
C7' | 0.0365 (17) | 0.0368 (18) | 0.041 (2) | −0.0046 (15) | −0.0048 (16) | −0.0014 (17) |
C8' | 0.0465 (19) | 0.0352 (18) | 0.051 (2) | 0.0062 (15) | −0.0039 (17) | 0.0052 (17) |
C9' | 0.063 (2) | 0.036 (2) | 0.058 (3) | 0.0126 (18) | 0.008 (2) | 0.0006 (19) |
C10' | 0.051 (2) | 0.048 (2) | 0.067 (3) | 0.0101 (18) | 0.020 (2) | 0.003 (2) |
C11' | 0.0426 (19) | 0.0365 (19) | 0.043 (2) | −0.0018 (15) | −0.0009 (17) | 0.0003 (17) |
C12' | 0.0393 (17) | 0.0324 (17) | 0.053 (2) | 0.0041 (14) | 0.0028 (18) | 0.0022 (17) |
O3' | 0.0614 (17) | 0.0407 (15) | 0.0662 (19) | 0.0029 (12) | 0.0232 (16) | 0.0095 (13) |
O1—C13 | 1.219 (5) | O1'—C13' | 1.216 (4) |
O2—C13 | 1.304 (4) | O2'—C13' | 1.295 (4) |
O2—H2O | 0.8200 | O2'—H2O' | 0.8200 |
C13—C6 | 1.498 (5) | C13'—C6' | 1.490 (5) |
C6—C5 | 1.393 (5) | C6'—C5' | 1.392 (5) |
C6—C1 | 1.401 (5) | C6'—C1' | 1.421 (5) |
C5—C4 | 1.370 (6) | C5'—C4' | 1.378 (5) |
C5—H5 | 0.9300 | C5'—H5' | 0.9300 |
C4—C3 | 1.379 (6) | C4'—C3' | 1.374 (6) |
C4—H4 | 0.9300 | C4'—H4' | 0.9300 |
C3—C2 | 1.370 (5) | C3'—C2' | 1.380 (6) |
C3—H3 | 0.9300 | C3'—H3' | 0.9300 |
C2—C1 | 1.402 (5) | C2'—C1' | 1.395 (5) |
C2—H2 | 0.9300 | C2'—H2' | 0.9300 |
C1—N | 1.407 (5) | C1'—N' | 1.396 (5) |
N—C7 | 1.359 (5) | N'—C7' | 1.366 (5) |
N—H1 | 0.8600 | N'—H1' | 0.8600 |
C7—C12 | 1.364 (5) | C7'—C12' | 1.358 (5) |
C7—C8 | 1.504 (5) | C7'—C8' | 1.500 (5) |
C8—C9 | 1.514 (6) | C8'—C9' | 1.513 (6) |
C8—H8A | 0.9700 | C8'—H8'A | 0.9700 |
C8—H8B | 0.9700 | C8'—H8'B | 0.9700 |
C9—C10 | 1.524 (6) | C9'—C10' | 1.515 (5) |
C9—H9A | 0.9700 | C9'—H9'A | 0.9700 |
C9—H9B | 0.9700 | C9'—H9'B | 0.9700 |
C10—C11 | 1.494 (5) | C10'—C11' | 1.499 (5) |
C10—H10A | 0.9700 | C10'—H10C | 0.9700 |
C10—H10B | 0.9700 | C10'—H10D | 0.9700 |
C11—O3 | 1.234 (4) | C11'—O3' | 1.242 (4) |
C11—C12 | 1.433 (5) | C11'—C12' | 1.425 (5) |
C12—H12 | 0.9300 | C12'—H12' | 0.9300 |
C13—O2—H2O | 109.5 | C13'—O2'—H2O' | 109.5 |
O1—C13—O2 | 123.1 (4) | O1'—C13'—O2' | 122.8 (3) |
O1—C13—C6 | 124.3 (4) | O1'—C13'—C6' | 124.5 (3) |
O2—C13—C6 | 112.6 (3) | O2'—C13'—C6' | 112.7 (3) |
C5—C6—C1 | 119.0 (4) | C5'—C6'—C1' | 119.0 (3) |
C5—C6—C13 | 118.5 (3) | C5'—C6'—C13' | 119.4 (3) |
C1—C6—C13 | 122.4 (3) | C1'—C6'—C13' | 121.6 (3) |
C4—C5—C6 | 121.8 (4) | C4'—C5'—C6' | 121.6 (4) |
C4—C5—H5 | 119.1 | C4'—C5'—H5' | 119.2 |
C6—C5—H5 | 119.1 | C6'—C5'—H5' | 119.2 |
C5—C4—C3 | 118.5 (4) | C3'—C4'—C5' | 119.1 (4) |
C5—C4—H4 | 120.8 | C3'—C4'—H4' | 120.4 |
C3—C4—H4 | 120.8 | C5'—C4'—H4' | 120.4 |
C2—C3—C4 | 121.8 (4) | C4'—C3'—C2' | 121.0 (4) |
C2—C3—H3 | 119.1 | C4'—C3'—H3' | 119.5 |
C4—C3—H3 | 119.1 | C2'—C3'—H3' | 119.5 |
C3—C2—C1 | 119.9 (4) | C3'—C2'—C1' | 120.8 (4) |
C3—C2—H2 | 120.0 | C3'—C2'—H2' | 119.6 |
C1—C2—H2 | 120.0 | C1'—C2'—H2' | 119.6 |
C6—C1—C2 | 118.9 (4) | C2'—C1'—N' | 122.4 (3) |
C6—C1—N | 118.7 (3) | C2'—C1'—C6' | 118.3 (3) |
C2—C1—N | 122.3 (3) | N'—C1'—C6' | 119.2 (3) |
C7—N—C1 | 131.6 (3) | C7'—N'—C1' | 130.7 (3) |
C7—N—H1 | 114.2 | C7'—N'—H1' | 114.6 |
C1—N—H1 | 114.2 | C1'—N'—H1' | 114.6 |
N—C7—C12 | 125.9 (3) | C12'—C7'—N' | 126.0 (3) |
N—C7—C8 | 113.2 (3) | C12'—C7'—C8' | 120.7 (3) |
C12—C7—C8 | 121.0 (3) | N'—C7'—C8' | 113.3 (3) |
C7—C8—C9 | 113.6 (3) | C7'—C8'—C9' | 112.9 (3) |
C7—C8—H8A | 108.8 | C7'—C8'—H8'A | 109.0 |
C9—C8—H8A | 108.8 | C9'—C8'—H8'A | 109.0 |
C7—C8—H8B | 108.8 | C7'—C8'—H8'B | 109.0 |
C9—C8—H8B | 108.8 | C9'—C8'—H8'B | 109.0 |
H8A—C8—H8B | 107.7 | H8'A—C8'—H8'B | 107.8 |
C8—C9—C10 | 109.7 (4) | C8'—C9'—C10' | 109.3 (4) |
C8—C9—H9A | 109.7 | C8'—C9'—H9'A | 109.8 |
C10—C9—H9A | 109.7 | C10'—C9'—H9'A | 109.8 |
C8—C9—H9B | 109.7 | C8'—C9'—H9'B | 109.8 |
C10—C9—H9B | 109.7 | C10'—C9'—H9'B | 109.8 |
H9A—C9—H9B | 108.2 | H9'A—C9'—H9'B | 108.3 |
C11—C10—C9 | 112.0 (3) | C11'—C10'—C9' | 112.0 (3) |
C11—C10—H10A | 109.2 | C11'—C10'—H10C | 109.2 |
C9—C10—H10A | 109.2 | C9'—C10'—H10C | 109.2 |
C11—C10—H10B | 109.2 | C11'—C10'—H10D | 109.2 |
C9—C10—H10B | 109.2 | C9'—C10'—H10D | 109.2 |
H10A—C10—H10B | 107.9 | H10C—C10'—H10D | 107.9 |
O3—C11—C12 | 122.3 (3) | O3'—C11'—C12' | 122.3 (3) |
O3—C11—C10 | 118.6 (3) | O3'—C11'—C10' | 119.2 (3) |
C12—C11—C10 | 119.0 (3) | C12'—C11'—C10' | 118.4 (3) |
C7—C12—C11 | 121.4 (3) | C7'—C12'—C11' | 122.0 (3) |
C7—C12—H12 | 119.3 | C7'—C12'—H12' | 119.0 |
C11—C12—H12 | 119.3 | C11'—C12'—H12' | 119.0 |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2O···O3′ | 0.82 | 1.81 | 2.562 (4) | 151 |
N—H1···O1 | 0.86 | 1.98 | 2.665 (4) | 136 |
O2′—H2O′···O3i | 0.82 | 1.78 | 2.562 (4) | 160 |
N′—H1′···O1′ | 0.86 | 1.98 | 2.659 (4) | 135 |
Symmetry code: (i) x, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | C13H13NO3 |
Mr | 231.24 |
Crystal system, space group | Orthorhombic, Pna21 |
Temperature (K) | 293 |
a, b, c (Å) | 11.3867 (11), 13.0719 (9), 15.3389 (14) |
V (Å3) | 2283.2 (3) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.2 × 0.2 × 0.2 |
Data collection | |
Diffractometer | Siemens P4 |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 2549, 2266, 1800 |
Rint | 0.015 |
(sin θ/λ)max (Å−1) | 0.606 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.046, 0.132, 0.93 |
No. of reflections | 2266 |
No. of parameters | 307 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.18, −0.25 |
Computer programs: XSCANS (Siemens, 1991), XSCANS, SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXTL/PC (Sheldrick, 1990), SHELXL97.
C1—N | 1.407 (5) | C1'—N' | 1.396 (5) |
N—C7 | 1.359 (5) | N'—C7' | 1.366 (5) |
C7—C12 | 1.364 (5) | C7'—C12' | 1.358 (5) |
C11—C12 | 1.433 (5) | C11'—C12' | 1.425 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2O···O3' | 0.82 | 1.81 | 2.562 (4) | 151.1 |
N—H1···O1 | 0.86 | 1.98 | 2.665 (4) | 136.1 |
O2'—H2O'···O3i | 0.82 | 1.78 | 2.562 (4) | 159.6 |
N'—H1'···O1' | 0.86 | 1.98 | 2.659 (4) | 134.9 |
Symmetry code: (i) x, y+1, z. |
The preparation of the title compound has been reported in the literature in a condensation reaction with isopropylidene malonate (Strozhev & Lielbriedis, 1990). The compound was obtained in 37% yield and no X-ray crystallographic determination has hitherto been performed. A search of the Cambridge Structural Database (Version 5.28; Allen, 2002) yielded no hits.
The title compound crystallizes with two molecules per asymmetric unit. In each molecule the cyclohexene ring adopts a slightly distorted envelope conformation, with C9 and C9' as flap atoms. The bond distances C1—N, N—C7, C7═C12, C12—C11, C1'—N,' N'—C7', C7'═C12' and C12'—C11' (Table 1 and Fig. 1) clearly indicate that the enamine tautomer is present in the crystal structure, rather than the imine normally expected from a Schiff base reaction. The C—N—C bond angles, 131.6 (3)° and 130.7 (3)°, are typical of Nsp3.
The X-ray crystallographic determination has revealed that the title compound exists in the solid state in a pseudo-polymeric arrangement, held together by intermolecular O—H···O hydrogen bonds. These connect carboxyl and C═O groups of neighbouring molecules.