Literature DB >> 22091196

Methyl 2-(3a,8a-dimethyl-4-oxodeca-hydro-azulen-6-yl)acrylate.

Mohamed Tebbaa, Ahmed Benharref, Moha Berraho, Jean Claude Daran, Mohamed Akssira, Ahmed Elhakmaoui.   

Abstract

The title compound, C(16)H(24)O(3), was synthesized from ilicic acid, which was isolated from the aerial part of Inula viscosa- (L) Aiton [or Dittrichia viscosa- (L) Greuter]. The asymmetric unit contains two independent mol-ecules, in each of which the seven-membered ring shows a chair conformation, whereas the five-membered ring presents disorder. In the two molecules, three C atoms in the five-membered ring are disordered over two positions with site-occupancy factors of 0.53/0.47 and 0.83/0.17. The dihedral angle between the two rings is different in the two mol-ecules [31.7 (3) and 47.7 (7)°]. The crystal structure is stabilized by weak inter-molecular C-H⋯O hydrogen-bond inter-actions.

Entities:  

Year:  2011        PMID: 22091196      PMCID: PMC3213619          DOI: 10.1107/S1600536811029928

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For background to the medicinal inter­est in Inula viscosa­ (L) Aiton [or Dittrichia viscosa­ (L) Greuter], see: Shtacher & Kasshman (1970 ▶); Chiappini et al. (1982 ▶); Azoulay et al. (1986 ▶); Bohlman et al. (1977 ▶); Ceccherelli et al. (1988 ▶); Geissman & Toribio (1967 ▶). For conformational analysis, see: Cremer & Pople (1975 ▶). For a related synthesis, see: Barrero et al. (2009 ▶).

Experimental

Crystal data

C16H24O3 M = 264.35 Monoclinic, a = 6.6954 (3) Å b = 6.9447 (3) Å c = 31.6168 (18) Å β = 90.095 (7)° V = 1470.10 (12) Å3 Z = 4 Mo Kα radiation μ = 0.08 mm−1 T = 180 K 0.33 × 0.23 × 0.15 mm

Data collection

Agilent Xcalibur Eos Gemini ultra diffractometer Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010 ▶) T min = 0.843, T max = 1.000 9032 measured reflections 5575 independent reflections 4990 reflections with I > 2σ(I) R int = 0.020

Refinement

R[F 2 > 2σ(F 2)] = 0.042 wR(F 2) = 0.110 S = 1.06 5575 reflections 356 parameters 19 restraints H-atom parameters constrained Δρmax = 0.14 e Å−3 Δρmin = −0.19 e Å−3 Data collection: CrysAlis PRO (Agilent, 2010 ▶); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEPIII (Burnett & Johnson, 1996 ▶) and ORTEP-3 for Windows (Farrugia, 1997 ▶); software used to prepare material for publication: WinGX (Farrugia, 1999 ▶ and PLATON (Spek, 2009 ▶). Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536811029928/om2451sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811029928/om2451Isup2.hkl Supplementary material file. DOI: 10.1107/S1600536811029928/om2451Isup3.cml Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C16H24O3F(000) = 576
Mr = 264.35Dx = 1.194 Mg m3
Monoclinic, P21Mo Kα radiation, λ = 0.7107 Å
Hall symbol: P 2ybCell parameters from 3361 reflections
a = 6.6954 (3) Åθ = 3.6–29.2°
b = 6.9447 (3) ŵ = 0.08 mm1
c = 31.6168 (18) ÅT = 180 K
β = 90.095 (7)°Block, colourless
V = 1470.10 (12) Å30.33 × 0.23 × 0.15 mm
Z = 4
Agilent Xcalibur Eos Gemini ultra diffractometer5575 independent reflections
Radiation source: Enhance (Mo) X-ray Source4990 reflections with I > 2σ(I)
graphiteRint = 0.020
Detector resolution: 16.1978 pixels mm-1θmax = 26.4°, θmin = 3.6°
ω scansh = −8→8
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010)k = −8→8
Tmin = 0.843, Tmax = 1.000l = −36→39
9032 measured reflections
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.042Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.110H-atom parameters constrained
S = 1.06w = 1/[σ2(Fo2) + (0.058P)2 + 0.0579P] where P = (Fo2 + 2Fc2)/3
5575 reflections(Δ/σ)max = 0.011
356 parametersΔρmax = 0.14 e Å3
19 restraintsΔρmin = −0.19 e Å3
Experimental. The crystal is twinned by pseudo-merohedry. The unit cell is monoclinic but it emulates an orthorhombic P 21 21 2 cell.Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. CrysAlisPro (Agilent,2010)
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes.
xyzUiso*/UeqOcc. (<1)
O11−0.3396 (6)0.7937 (7)0.78385 (10)0.0491 (9)
O12−0.1779 (6)0.7707 (7)0.72197 (8)0.0441 (9)
O130.0462 (8)0.4408 (6)0.90038 (11)0.0603 (11)
C110.0245 (7)0.7490 (7)0.83087 (10)0.0320 (10)
H11−0.10000.68680.83970.038*
C120.1966 (8)0.6169 (6)0.84329 (11)0.0370 (11)
H12A0.32330.68150.83880.044*
H12B0.19430.50080.82620.044*
C130.1702 (9)0.5650 (7)0.89132 (14)0.0376 (11)
C160.0506 (8)0.9418 (7)0.90041 (11)0.0344 (10)
H16A0.01051.06720.91090.041*
H16B−0.04530.84910.91110.041*
C170.0323 (8)0.9457 (7)0.85143 (11)0.0371 (11)
H17A−0.08781.01590.84390.045*
H17B0.14531.01580.84000.045*
C140.2954 (9)0.6686 (7)0.92227 (13)0.0375 (11)
C150.2545 (8)0.8936 (7)0.91989 (13)0.0365 (11)
C18A0.2343 (11)0.9472 (10)0.96834 (13)0.068 (2)0.53
H18A0.32331.05320.97500.082*0.53
H18B0.09860.98790.97430.082*0.53
C19A0.2859 (15)0.7758 (13)0.99513 (19)0.0438 (13)0.53
H19A0.20780.77461.02100.053*0.53
H19B0.42670.77561.00240.053*0.53
C20A0.2344 (11)0.6059 (9)0.96745 (13)0.0562 (16)0.53
H20A0.09260.57780.96880.067*0.53
H20B0.30820.49240.97610.067*0.53
C18B0.2343 (11)0.9472 (10)0.96834 (13)0.068 (2)0.47
H18C0.36380.97890.98020.082*0.47
H18D0.14621.05690.97190.082*0.47
C19B0.1550 (14)0.7852 (12)0.9882 (2)0.0438 (13)0.47
H19C0.01050.78740.98610.053*0.47
H19D0.19110.78581.01790.053*0.47
C20B0.2344 (11)0.6059 (9)0.96745 (13)0.0562 (16)0.47
H20C0.13240.50680.96640.067*0.47
H20D0.34880.55650.98280.067*0.47
C1110.0153 (7)0.7762 (8)0.78377 (12)0.0350 (10)
C1120.1773 (8)0.7999 (10)0.75949 (14)0.0527 (14)
H11A0.16320.81880.73050.063*
H11B0.30390.79740.77160.063*
C113−0.1814 (7)0.7805 (8)0.76432 (12)0.0340 (10)
C114−0.3611 (8)0.7761 (8)0.69985 (12)0.0453 (11)
H11C−0.43070.89300.70660.068*
H11D−0.44130.66760.70790.068*
H11E−0.33590.77150.67000.068*
C1410.5147 (9)0.6146 (9)0.91621 (15)0.0562 (16)
H14A0.55580.64760.88800.084*
H14B0.53110.47860.92050.084*
H14C0.59510.68350.93630.084*
C1510.4187 (10)1.0125 (9)0.90107 (18)0.0537 (15)
H15A0.38091.14590.90150.081*
H15B0.44170.97260.87240.081*
H15C0.53860.99540.91730.081*
O21−0.3368 (5)0.2891 (7)0.71830 (9)0.0455 (8)
O22−0.1755 (6)0.3099 (7)0.78059 (8)0.0435 (8)
O230.0557 (8)0.6369 (6)0.60233 (12)0.0710 (13)
C210.0213 (7)0.3281 (7)0.67099 (11)0.0336 (10)
H21−0.10500.38900.66280.040*
C220.1921 (8)0.4596 (6)0.65588 (14)0.0435 (12)
H22A0.19430.57480.67320.052*
H22B0.31830.39330.65980.052*
C230.1736 (7)0.5141 (6)0.61251 (15)0.0367 (10)
C260.0504 (8)0.1303 (7)0.60083 (14)0.0422 (11)
H26A−0.04910.21940.59020.051*
H26B0.01190.00290.59130.051*
C270.0351 (8)0.1312 (7)0.64743 (13)0.0423 (12)
H27A0.15030.06310.65850.051*
H27B−0.08200.05650.65510.051*
C240.2925 (8)0.4082 (7)0.57727 (13)0.0343 (10)
C250.2532 (7)0.1810 (6)0.57876 (14)0.0364 (11)
C28A0.2445 (10)0.1255 (7)0.53289 (15)0.0547 (15)0.83
H28A0.34500.02830.52710.066*0.83
H28B0.11460.07070.52660.066*0.83
C29A0.2795 (15)0.2957 (12)0.50553 (16)0.0775 (19)0.83
H29A0.41780.30130.49650.093*0.83
H29B0.19430.29180.48070.093*0.83
C30A0.2296 (11)0.4625 (8)0.53251 (15)0.0566 (17)0.83
H30A0.08740.48880.53140.068*0.83
H30B0.30100.57630.52310.068*0.83
C28B0.2445 (10)0.1255 (7)0.53289 (15)0.0547 (15)0.17
H28C0.37760.10800.52140.066*0.17
H28D0.16930.00730.52910.066*0.17
C29B0.143 (5)0.289 (3)0.5125 (7)0.0775 (19)0.17
H29C0.16740.28910.48220.093*0.17
H29D−0.00020.28300.51730.093*0.17
C30B0.2296 (11)0.4625 (8)0.53251 (15)0.0566 (17)0.17
H30C0.13150.56530.53330.068*0.17
H30D0.34430.50670.51650.068*0.17
C2110.0190 (7)0.3028 (7)0.71832 (11)0.0325 (10)
C2120.1757 (7)0.2744 (9)0.74169 (12)0.0445 (12)
H21A0.30160.26850.72930.053*
H21B0.16210.26010.77080.053*
C213−0.1856 (7)0.2982 (7)0.73821 (13)0.0333 (9)
C214−0.3691 (8)0.2993 (11)0.80196 (13)0.0582 (15)
H21C−0.42980.17670.79630.087*
H21D−0.45420.40030.79170.087*
H21E−0.35030.31380.83190.087*
C2410.5158 (7)0.4632 (8)0.58597 (18)0.0523 (14)
H24A0.55560.41330.61300.078*
H24B0.52950.60080.58600.078*
H24C0.59900.40910.56430.078*
C2510.4216 (10)0.0690 (8)0.6025 (2)0.0612 (16)
H25A0.53980.06580.58540.092*
H25B0.3779−0.06030.60810.092*
H25C0.45060.13250.62880.092*
U11U22U33U12U13U23
O110.0296 (16)0.068 (2)0.0497 (16)0.0131 (19)−0.0007 (16)−0.0057 (19)
O120.0329 (16)0.067 (2)0.0324 (11)−0.0016 (19)−0.0084 (14)0.0003 (16)
O130.069 (3)0.045 (2)0.067 (2)−0.020 (2)−0.003 (2)0.0090 (18)
C110.026 (2)0.040 (3)0.0300 (17)−0.0028 (19)0.0027 (16)−0.0067 (17)
C120.046 (3)0.039 (3)0.0263 (16)0.014 (3)−0.0010 (19)−0.0137 (17)
C130.054 (3)0.0261 (19)0.0330 (18)0.006 (2)0.001 (2)0.0034 (15)
C160.037 (2)0.038 (3)0.0281 (18)0.006 (2)0.0088 (19)−0.0104 (17)
C170.043 (3)0.037 (2)0.0315 (18)0.009 (2)0.0012 (19)0.0118 (18)
C140.039 (3)0.038 (3)0.0361 (19)−0.001 (3)0.003 (2)0.0045 (18)
C150.043 (3)0.043 (2)0.0235 (16)−0.004 (2)0.0041 (18)−0.0050 (16)
C18A0.077 (5)0.103 (4)0.0249 (19)0.025 (4)−0.011 (2)−0.004 (2)
C19A0.049 (3)0.056 (3)0.026 (2)0.000 (4)−0.003 (2)0.003 (3)
C20A0.069 (4)0.066 (4)0.034 (2)0.002 (3)0.001 (3)0.000 (2)
C18B0.077 (5)0.103 (4)0.0249 (19)0.025 (4)−0.011 (2)−0.004 (2)
C19B0.049 (3)0.056 (3)0.026 (2)0.000 (4)−0.003 (2)0.003 (3)
C20B0.069 (4)0.066 (4)0.034 (2)0.002 (3)0.001 (3)0.000 (2)
C1110.029 (2)0.034 (2)0.042 (2)0.0037 (19)−0.0016 (18)−0.007 (2)
C1120.034 (3)0.083 (4)0.0409 (18)0.019 (3)0.008 (2)−0.006 (2)
C1130.034 (2)0.035 (2)0.0333 (17)−0.002 (2)0.0013 (19)−0.0075 (19)
C1140.043 (3)0.040 (2)0.053 (2)−0.012 (2)−0.014 (2)0.003 (2)
C1410.061 (4)0.060 (4)0.047 (2)0.026 (3)−0.003 (3)0.002 (3)
C1510.052 (3)0.052 (3)0.057 (3)−0.004 (3)−0.004 (3)0.008 (2)
O210.0226 (14)0.067 (2)0.0464 (15)0.0066 (18)0.0044 (14)0.0054 (18)
O220.0311 (15)0.061 (2)0.0383 (12)0.0060 (18)0.0117 (14)0.0011 (16)
O230.096 (3)0.0341 (18)0.083 (2)0.030 (2)0.035 (3)0.0178 (18)
C210.0238 (19)0.031 (2)0.046 (2)−0.0050 (18)0.0084 (18)−0.0005 (17)
C220.038 (3)0.027 (2)0.065 (3)−0.003 (2)0.015 (2)−0.006 (2)
C230.030 (2)0.0210 (18)0.059 (2)−0.0053 (18)0.014 (2)−0.0034 (16)
C260.039 (3)0.024 (2)0.064 (3)−0.009 (2)0.008 (2)−0.0007 (19)
C270.038 (3)0.031 (2)0.057 (2)−0.013 (2)0.014 (2)−0.016 (2)
C240.036 (2)0.028 (2)0.038 (2)0.002 (2)0.012 (2)0.0003 (16)
C250.039 (3)0.0191 (18)0.051 (2)0.0026 (19)0.012 (2)−0.0040 (16)
C28A0.067 (4)0.033 (2)0.064 (3)0.000 (2)0.005 (3)−0.025 (2)
C29A0.106 (5)0.084 (5)0.043 (3)0.007 (5)0.002 (3)−0.004 (3)
C30A0.073 (4)0.044 (3)0.052 (2)0.017 (3)0.006 (3)0.018 (2)
C28B0.067 (4)0.033 (2)0.064 (3)0.000 (2)0.005 (3)−0.025 (2)
C29B0.106 (5)0.084 (5)0.043 (3)0.007 (5)0.002 (3)−0.004 (3)
C30B0.073 (4)0.044 (3)0.052 (2)0.017 (3)0.006 (3)0.018 (2)
C2110.026 (2)0.037 (2)0.0346 (19)0.002 (2)0.0069 (18)−0.007 (2)
C2120.026 (2)0.069 (3)0.0380 (17)0.017 (2)0.0119 (19)0.000 (2)
C2130.024 (2)0.029 (2)0.047 (2)0.0027 (19)0.0126 (19)0.0012 (19)
C2140.036 (3)0.091 (4)0.048 (2)0.000 (3)0.027 (2)−0.002 (3)
C2410.034 (3)0.045 (3)0.078 (3)−0.005 (2)0.018 (3)0.000 (3)
C2510.048 (3)0.032 (3)0.104 (4)0.025 (2)0.006 (3)−0.009 (2)
O11—C1131.229 (6)O21—C2131.193 (6)
O12—C1131.341 (4)O22—C2131.344 (4)
O12—C1141.413 (6)O22—C2141.464 (6)
O13—C131.231 (7)O23—C231.206 (7)
C11—C1111.502 (5)C21—C2111.507 (5)
C11—C171.513 (6)C21—C221.540 (6)
C11—C121.524 (6)C21—C271.560 (6)
C11—H110.9800C21—H210.9800
C12—C131.571 (5)C22—C231.428 (6)
C12—H12A0.9700C22—H22A0.9700
C12—H12B0.9700C22—H22B0.9700
C13—C141.475 (7)C23—C241.554 (6)
C16—C151.535 (7)C26—C271.477 (6)
C16—C171.554 (5)C26—C251.567 (7)
C16—H16A0.9700C26—H26A0.9700
C16—H16B0.9700C26—H26B0.9700
C17—H17A0.9700C27—H27A0.9700
C17—H17B0.9700C27—H27B0.9700
C14—C1411.528 (8)C24—C30A1.524 (7)
C14—C20A1.548 (6)C24—C2411.567 (8)
C14—C151.588 (6)C24—C251.600 (6)
C15—C1511.498 (8)C25—C28A1.502 (6)
C15—C18A1.582 (5)C25—C2511.563 (8)
C18A—C19A1.501 (10)C28A—C29A1.484 (9)
C18A—H18A0.9700C28A—H28A0.9700
C18A—H18B0.9700C28A—H28B0.9700
C19A—C20A1.509 (10)C29A—C30A1.477 (9)
C19A—H19A0.9700C29A—H29A0.9700
C19A—H19B0.9700C29A—H29B0.9700
C20A—H20A0.9700C30A—H30A0.9700
C20A—H20B0.9700C30A—H30B0.9700
C19B—H19C0.9700C29B—H29C0.9700
C19B—H19D0.9700C29B—H29D0.9700
C111—C1121.339 (7)C211—C2121.299 (7)
C111—C1131.454 (7)C211—C2131.508 (6)
C112—H11A0.9300C212—H21A0.9300
C112—H11B0.9300C212—H21B0.9300
C114—H11C0.9600C214—H21C0.9600
C114—H11D0.9600C214—H21D0.9600
C114—H11E0.9600C214—H21E0.9600
C141—H14A0.9600C241—H24A0.9600
C141—H14B0.9600C241—H24B0.9600
C141—H14C0.9600C241—H24C0.9600
C151—H15A0.9600C251—H25A0.9600
C151—H15B0.9600C251—H25B0.9600
C151—H15C0.9600C251—H25C0.9600
C113—O12—C114118.6 (4)C213—O22—C214114.3 (4)
C111—C11—C17108.3 (4)C211—C21—C22112.6 (4)
C111—C11—C12111.2 (3)C211—C21—C27111.9 (4)
C17—C11—C12114.0 (4)C22—C21—C27109.1 (3)
C111—C11—H11107.7C211—C21—H21107.7
C17—C11—H11107.7C22—C21—H21107.7
C12—C11—H11107.7C27—C21—H21107.7
C11—C12—C13107.6 (4)C23—C22—C21113.0 (4)
C11—C12—H12A110.2C23—C22—H22A109.0
C13—C12—H12A110.2C21—C22—H22A109.0
C11—C12—H12B110.2C23—C22—H22B109.0
C13—C12—H12B110.2C21—C22—H22B109.0
H12A—C12—H12B108.5H22A—C22—H22B107.8
O13—C13—C14124.8 (4)O23—C23—C22120.0 (4)
O13—C13—C12117.5 (5)O23—C23—C24118.6 (4)
C14—C13—C12117.7 (4)C22—C23—C24121.2 (4)
C15—C16—C17118.3 (4)C27—C26—C25120.2 (4)
C15—C16—H16A107.7C27—C26—H26A107.3
C17—C16—H16A107.7C25—C26—H26A107.3
C15—C16—H16B107.7C27—C26—H26B107.3
C17—C16—H16B107.7C25—C26—H26B107.3
H16A—C16—H16B107.1H26A—C26—H26B106.9
C11—C17—C16114.6 (4)C26—C27—C21119.0 (4)
C11—C17—H17A108.6C26—C27—H27A107.6
C16—C17—H17A108.6C21—C27—H27A107.6
C11—C17—H17B108.6C26—C27—H27B107.6
C16—C17—H17B108.6C21—C27—H27B107.6
H17A—C17—H17B107.6H27A—C27—H27B107.0
C13—C14—C141110.1 (4)C30A—C24—C23114.0 (4)
C13—C14—C20A109.0 (4)C30A—C24—C241111.5 (4)
C141—C14—C20A107.5 (5)C23—C24—C241104.3 (4)
C13—C14—C15110.5 (4)C30A—C24—C25103.1 (4)
C141—C14—C15113.6 (5)C23—C24—C25111.2 (4)
C20A—C14—C15106.0 (4)C241—C24—C25113.0 (4)
C151—C15—C16111.9 (4)C28A—C25—C251111.4 (4)
C151—C15—C18A108.5 (5)C28A—C25—C26109.8 (4)
C16—C15—C18A105.1 (4)C251—C25—C26107.4 (4)
C151—C15—C14115.8 (5)C28A—C25—C24103.4 (4)
C16—C15—C14112.8 (4)C251—C25—C24112.8 (5)
C18A—C15—C14101.6 (4)C26—C25—C24112.2 (4)
C19A—C18A—C15109.9 (5)C29A—C28A—C25110.6 (4)
C19A—C18A—H18A109.7C29A—C28A—H28A109.5
C15—C18A—H18A109.7C25—C28A—H28A109.5
C19A—C18A—H18B109.7C29A—C28A—H28B109.5
C15—C18A—H18B109.7C25—C28A—H28B109.5
H18A—C18A—H18B108.2H28A—C28A—H28B108.1
C18A—C19A—C20A103.9 (5)C30A—C29A—C28A104.6 (4)
C18A—C19A—H19A111.0C30A—C29A—H29A110.8
C20A—C19A—H19A111.0C28A—C29A—H29A110.8
C18A—C19A—H19B111.0C30A—C29A—H29B110.8
C20A—C19A—H19B111.0C28A—C29A—H29B110.8
H19A—C19A—H19B109.0H29A—C29A—H29B108.9
C19A—C20A—C14104.8 (5)C29A—C30A—C24106.2 (5)
C19A—C20A—H20A110.8C29A—C30A—H30A110.5
C14—C20A—H20A110.8C24—C30A—H30A110.5
C19A—C20A—H20B110.8C29A—C30A—H30B110.5
C14—C20A—H20B110.8C24—C30A—H30B110.5
H20A—C20A—H20B108.9H30A—C30A—H30B108.7
H19C—C19B—H19D108.2H29C—C29B—H29D108.8
C112—C111—C113119.3 (4)C212—C211—C21125.1 (4)
C112—C111—C11123.4 (4)C212—C211—C213119.6 (3)
C113—C111—C11117.3 (4)C21—C211—C213115.2 (4)
C111—C112—H11A120.0C211—C212—H21A120.0
C111—C112—H11B120.0C211—C212—H21B120.0
H11A—C112—H11B120.0H21A—C212—H21B120.0
O11—C113—O12121.3 (4)O21—C213—O22124.9 (4)
O11—C113—C111124.7 (3)O21—C213—C211123.5 (3)
O12—C113—C111113.9 (4)O22—C213—C211111.6 (4)
O12—C114—H11C109.5O22—C214—H21C109.5
O12—C114—H11D109.5O22—C214—H21D109.5
H11C—C114—H11D109.5H21C—C214—H21D109.5
O12—C114—H11E109.5O22—C214—H21E109.5
H11C—C114—H11E109.5H21C—C214—H21E109.5
H11D—C114—H11E109.5H21D—C214—H21E109.5
C14—C141—H14A109.5C24—C241—H24A109.5
C14—C141—H14B109.5C24—C241—H24B109.5
H14A—C141—H14B109.5H24A—C241—H24B109.5
C14—C141—H14C109.5C24—C241—H24C109.5
H14A—C141—H14C109.5H24A—C241—H24C109.5
H14B—C141—H14C109.5H24B—C241—H24C109.5
C15—C151—H15A109.5C25—C251—H25A109.5
C15—C151—H15B109.5C25—C251—H25B109.5
H15A—C151—H15B109.5H25A—C251—H25B109.5
C15—C151—H15C109.5C25—C251—H25C109.5
H15A—C151—H15C109.5H25A—C251—H25C109.5
H15B—C151—H15C109.5H25B—C251—H25C109.5
D—H···AD—HH···AD···AD—H···A
C112—H11B···O11i0.932.423.325 (7)165
C212—H21A···O21i0.932.453.348 (6)162
C26—H26B···O23ii0.972.583.427 (6)146
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
C112—H11B⋯O11i0.932.423.325 (7)165
C212—H21A⋯O21i0.932.453.348 (6)162
C26—H26B⋯O23ii0.972.583.427 (6)146

Symmetry codes: (i) ; (ii) .

  6 in total

1.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

2.  Structure of Cyperanic Acid, a New Sesquiterpene from Dittrichia viscosa.

Authors:  P Ceccherelli; M Curini; M C Marcotullio; A Menghini
Journal:  J Nat Prod       Date:  1988-09       Impact factor: 4.050

3.  [Helenine and santonine, the 12-carboxy-eudesma-3,11(13) diene].

Authors:  P Azoulay; J P Reynier; G Balansard; M Gasquet; P Timon-David
Journal:  Pharm Acta Helv       Date:  1986

4.  Flavonoids from Dittrichia viscosa.

Authors:  I Chiappini; G Fardella; A Menghini; C Rossi
Journal:  Planta Med       Date:  1982-03       Impact factor: 3.352

5.  12-carboxyeudesma-3,11(13)-diene. A novel sesquiterpenic acid with a narrow antifungal spectrum.

Authors:  G Shtacher; Y Kashman
Journal:  J Med Chem       Date:  1970-11       Impact factor: 7.446

6.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  6 in total

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