Literature DB >> 24454129

(1R,4R,6S,7S)-5,5-Di-chloro-1,4,8,8-tetra-methyl-tri-cyclo-[5.4.1(1,7).0(4,6)]dodecan-12-one.

Ahmed Benharref1, Jamal El Karroumi1, Jean-Claude Daran2, Moha Berraho1.   

Abstract

The title compound, C16H24Cl2O, was synthesized in three steps from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzo-cyclo-heptene), which was isolated from essential oil of the Atlas cedar (cedrus atlantica). The asymmetric unit contains two independent mol-ecules with similar conformations. Each mol-ecule is built up from two fused seven-membered rings and an additional three-membered ring arising from the reaction of himachalene with di-chloro-carbene. The dihedral angles between the mean planes of the two seven-membered rings are 75.03 (9) and 75.02 (9)° in the two independent mol-ecules.

Entities:  

Year:  2013        PMID: 24454129      PMCID: PMC3884353          DOI: 10.1107/S1600536813028791

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


Related literature

For the reactivity of this sesquiterpene, see: El Jamili et al. (2002 ▶); Lassaba et al. (1997 ▶). For its biological activity, see: Elhaib et al. (2011 ▶). For a related structure, see: Benharref et al. (2013 ▶). For conformational analysis, see: Cremer & Pople (1975 ▶).

Experimental

Crystal data

C16H24Cl2O M = 303.25 Triclinic, a = 6.5835 (2) Å b = 9.2584 (3) Å c = 12.8428 (5) Å α = 85.140 (3)° β = 84.795 (3)° γ = 89.067 (3)° V = 776.74 (5) Å3 Z = 2 Mo Kα radiation μ = 0.41 mm−1 T = 180 K 0.50 × 0.03 × 0.03 mm

Data collection

Agilent Xcalibur (Eos, Gemini ultra) diffractometer Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2013 ▶) T min = 0.822, T max = 0.988 15959 measured reflections 6301 independent reflections 5899 reflections with I > 2σ(I) R int = 0.030

Refinement

R[F 2 > 2σ(F 2)] = 0.030 wR(F 2) = 0.070 S = 1.05 6301 reflections 351 parameters 3 restraints H-atom parameters constrained Δρmax = 0.19 e Å−3 Δρmin = −0.15 e Å−3 Absolute structure: Flack & Bernardinelli (2000 ▶), 3127 Friedel pairs Absolute structure parameter: 0.05 (3) Data collection: CrysAlis PRO (Agilent, 2013 ▶); 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: ORTEP-3 for Windows (Farrugia, 2012 ▶); software used to prepare material for publication: WinGX (Farrugia, 2012 ▶). Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536813028791/bt6937sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536813028791/bt6937Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C16H24Cl2OZ = 2
Mr = 303.25F(000) = 324
Triclinic, P1Dx = 1.297 Mg m3
Hall symbol: P 1Mo Kα radiation, λ = 0.71073 Å
a = 6.5835 (2) ÅCell parameters from 6301 reflections
b = 9.2584 (3) Åθ = 3.1–26.4°
c = 12.8428 (5) ŵ = 0.41 mm1
α = 85.140 (3)°T = 180 K
β = 84.795 (3)°Needle, colourless
γ = 89.067 (3)°0.50 × 0.03 × 0.03 mm
V = 776.74 (5) Å3
Agilent Xcalibur (Eos, Gemini ultra) diffractometer6301 independent reflections
Radiation source: Enhance (Mo) X-ray Source5899 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.030
Detector resolution: 16.1978 pixels mm-1θmax = 26.4°, θmin = 3.1°
ω scansh = −8→8
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2013)k = −11→11
Tmin = 0.822, Tmax = 0.988l = −16→16
15959 measured reflections
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.030H-atom parameters constrained
wR(F2) = 0.070w = 1/[σ2(Fo2) + (0.0384P)2 + 0.0135P] where P = (Fo2 + 2Fc2)/3
S = 1.05(Δ/σ)max < 0.001
6301 reflectionsΔρmax = 0.19 e Å3
351 parametersΔρmin = −0.15 e Å3
3 restraintsAbsolute structure: Flack & Bernardinelli (2000), 3127 Friedel pairs
Primary atom site location: structure-invariant direct methodsAbsolute structure parameter: 0.05 (3)
Experimental. Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. CrysAlisPro (Agilent Technologies, 2013 )
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.
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 > 2σ(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.
xyzUiso*/Ueq
Cl2−0.55173 (7)0.67043 (6)0.24182 (4)0.03779 (14)
Cl1−0.12276 (7)0.65390 (5)0.27094 (4)0.03107 (12)
O10.1568 (2)1.00986 (16)0.33958 (12)0.0348 (3)
C7−0.1944 (3)0.95465 (19)0.37125 (14)0.0200 (4)
H7−0.13510.86130.40030.024*
C6−0.3450 (3)0.9136 (2)0.29500 (14)0.0203 (4)
H6−0.48890.94350.31510.024*
C5−0.3277 (3)0.7716 (2)0.24622 (14)0.0228 (4)
C4−0.2947 (3)0.9096 (2)0.17593 (14)0.0222 (4)
C3−0.0806 (3)0.9470 (2)0.12878 (15)0.0249 (4)
H3A−0.06480.91940.05570.030*
H3B0.01800.88840.16870.030*
C2−0.0269 (3)1.1079 (2)0.12843 (15)0.0276 (4)
H2A−0.11611.16510.08210.033*
H2B0.11541.12140.09740.033*
C1−0.0476 (3)1.1710 (2)0.23755 (16)0.0257 (4)
C11−0.2564 (3)1.2460 (2)0.25562 (15)0.0257 (4)
H11A−0.25691.33560.20780.031*
H11B−0.36201.18140.23540.031*
C10−0.3185 (3)1.2863 (2)0.36775 (16)0.0307 (4)
H10A−0.19501.31340.39990.037*
H10B−0.41031.37200.36460.037*
C9−0.4261 (3)1.1633 (2)0.43734 (15)0.0268 (4)
H9A−0.54221.13210.40110.032*
H9B−0.48371.20340.50290.032*
C8−0.3000 (3)1.0280 (2)0.46780 (14)0.0241 (4)
C12−0.0146 (3)1.0435 (2)0.31871 (14)0.0229 (4)
C14−0.4603 (3)0.9581 (2)0.10671 (16)0.0324 (5)
H14A−0.45430.89900.04670.049*
H14B−0.44051.06020.08150.049*
H14C−0.59360.94650.14690.049*
C130.1222 (3)1.2827 (2)0.24143 (18)0.0357 (5)
H13A0.11081.32120.31050.054*
H13B0.10801.36210.18700.054*
H13C0.25561.23560.22920.054*
C16−0.1382 (3)1.0656 (2)0.53919 (17)0.0349 (5)
H16A−0.20481.10530.60210.052*
H16B−0.04511.13780.50150.052*
H16C−0.06120.97800.55970.052*
C15−0.4447 (3)0.9173 (2)0.52973 (16)0.0332 (5)
H15A−0.50860.95920.59230.050*
H15B−0.36750.82990.55090.050*
H15C−0.55040.89190.48560.050*
Cl3−0.18678 (7)0.88753 (6)0.83571 (4)0.03989 (14)
Cl40.25097 (7)0.90785 (5)0.82503 (4)0.03505 (13)
O20.5852 (2)0.54459 (17)0.75362 (12)0.0367 (4)
C220.2470 (3)0.6078 (2)0.71903 (14)0.0216 (4)
H220.31550.70150.69380.026*
C230.0593 (3)0.6475 (2)0.79047 (13)0.0203 (4)
H23−0.07220.61740.76580.024*
C240.0441 (3)0.7881 (2)0.84020 (15)0.0255 (4)
C250.0528 (3)0.6489 (2)0.91026 (14)0.0235 (4)
C260.2462 (3)0.6118 (2)0.96257 (16)0.0292 (5)
H26A0.22710.63761.03610.035*
H26B0.35900.67130.92620.035*
C270.3070 (3)0.4512 (2)0.96203 (15)0.0305 (5)
H27A0.19950.39341.00480.037*
H27B0.43430.43640.99720.037*
C170.3412 (3)0.3893 (2)0.85254 (16)0.0281 (4)
C180.1452 (3)0.3153 (2)0.82720 (15)0.0273 (4)
H18A0.12710.22420.87320.033*
H18B0.02760.37930.84500.033*
C190.1398 (3)0.2793 (2)0.71244 (16)0.0316 (5)
H19A0.27950.25450.68390.038*
H19B0.05350.19310.71090.038*
C200.0575 (3)0.4033 (2)0.64249 (15)0.0283 (4)
H20A−0.07690.43240.67560.034*
H20B0.03370.36540.57490.034*
C210.1874 (3)0.54054 (19)0.61824 (14)0.0241 (4)
C280.4060 (3)0.5151 (2)0.77276 (15)0.0250 (4)
C30−0.1408 (3)0.5985 (2)0.97438 (16)0.0342 (5)
H30A−0.16000.65091.03780.051*
H30B−0.13070.49420.99430.051*
H30C−0.25720.61760.93270.051*
C290.5159 (3)0.2754 (3)0.8552 (2)0.0421 (6)
H29A0.53160.23040.78850.063*
H29B0.48340.20090.91280.063*
H29C0.64340.32300.86580.063*
C320.0631 (3)0.6546 (2)0.55706 (16)0.0352 (5)
H32A0.02810.61660.49210.053*
H32B0.14400.74270.54000.053*
H32C−0.06220.67730.60000.053*
C310.3815 (3)0.5080 (2)0.54861 (17)0.0367 (5)
H31A0.46380.43510.58600.055*
H31B0.46040.59710.53170.055*
H31C0.34440.47110.48370.055*
U11U22U33U12U13U23
Cl20.0375 (3)0.0381 (3)0.0399 (3)−0.0163 (2)−0.0103 (2)−0.0053 (2)
Cl10.0392 (3)0.0217 (3)0.0338 (3)0.00646 (19)−0.0096 (2)−0.0054 (2)
O10.0234 (8)0.0372 (9)0.0440 (9)0.0007 (6)−0.0064 (6)−0.0013 (7)
C70.0211 (9)0.0178 (9)0.0215 (9)−0.0003 (7)−0.0036 (7)−0.0023 (7)
C60.0187 (9)0.0205 (10)0.0217 (9)0.0014 (7)−0.0008 (7)−0.0024 (7)
C50.0226 (9)0.0233 (10)0.0239 (9)−0.0027 (8)−0.0072 (8)−0.0043 (8)
C40.0231 (9)0.0236 (10)0.0207 (9)0.0010 (7)−0.0045 (7)−0.0037 (7)
C30.0266 (10)0.0281 (11)0.0198 (9)0.0024 (8)0.0023 (7)−0.0048 (8)
C20.0272 (10)0.0291 (11)0.0247 (10)0.0011 (8)0.0041 (8)0.0006 (8)
C10.0276 (10)0.0224 (10)0.0261 (9)0.0000 (7)0.0010 (7)−0.0008 (8)
C110.0278 (10)0.0203 (10)0.0275 (10)0.0032 (7)0.0013 (8)0.0024 (8)
C100.0367 (11)0.0198 (10)0.0340 (11)0.0047 (8)0.0058 (9)−0.0028 (8)
C90.0310 (10)0.0242 (10)0.0245 (10)0.0019 (8)0.0064 (8)−0.0068 (8)
C80.0293 (10)0.0219 (9)0.0211 (9)−0.0032 (8)0.0009 (7)−0.0044 (8)
C120.0234 (10)0.0230 (9)0.0233 (9)0.0013 (7)−0.0018 (7)−0.0083 (8)
C140.0314 (11)0.0407 (12)0.0257 (10)0.0055 (9)−0.0076 (8)−0.0023 (9)
C130.0351 (11)0.0317 (12)0.0381 (12)−0.0075 (9)0.0057 (9)0.0014 (10)
C160.0458 (13)0.0327 (12)0.0284 (11)−0.0061 (10)−0.0076 (9)−0.0091 (9)
C150.0411 (12)0.0299 (11)0.0279 (10)−0.0047 (9)0.0017 (9)−0.0015 (9)
Cl30.0376 (3)0.0456 (3)0.0363 (3)0.0189 (2)0.0002 (2)−0.0097 (2)
Cl40.0410 (3)0.0226 (3)0.0418 (3)−0.0059 (2)−0.0005 (2)−0.0072 (2)
O20.0224 (7)0.0427 (9)0.0443 (9)−0.0031 (6)0.0003 (6)−0.0027 (7)
C220.0211 (9)0.0196 (9)0.0240 (9)−0.0014 (7)0.0003 (7)−0.0042 (8)
C230.0198 (9)0.0224 (10)0.0195 (9)0.0000 (7)−0.0032 (7)−0.0051 (7)
C240.0247 (10)0.0258 (10)0.0260 (10)0.0028 (8)0.0010 (8)−0.0071 (8)
C250.0257 (9)0.0249 (10)0.0208 (9)−0.0028 (8)−0.0023 (7)−0.0067 (8)
C260.0347 (11)0.0326 (12)0.0221 (10)−0.0056 (9)−0.0088 (8)−0.0051 (9)
C270.0364 (11)0.0334 (12)0.0223 (10)−0.0049 (9)−0.0103 (8)0.0036 (9)
C170.0316 (11)0.0239 (10)0.0289 (11)−0.0029 (8)−0.0048 (8)0.0000 (8)
C180.0320 (10)0.0207 (10)0.0288 (10)−0.0062 (8)−0.0037 (8)0.0025 (8)
C190.0410 (12)0.0197 (10)0.0356 (11)−0.0063 (9)−0.0101 (9)−0.0022 (9)
C200.0364 (11)0.0237 (10)0.0265 (10)−0.0046 (8)−0.0072 (8)−0.0068 (8)
C210.0296 (10)0.0222 (10)0.0203 (9)0.0024 (8)−0.0001 (7)−0.0036 (8)
C280.0245 (10)0.0264 (10)0.0251 (9)−0.0020 (8)−0.0016 (7)−0.0086 (8)
C300.0348 (12)0.0443 (13)0.0230 (10)−0.0085 (10)0.0036 (8)−0.0053 (9)
C290.0418 (13)0.0338 (13)0.0515 (15)0.0034 (10)−0.0157 (11)0.0037 (11)
C320.0481 (13)0.0315 (12)0.0263 (11)0.0062 (10)−0.0071 (9)−0.0011 (9)
C310.0466 (13)0.0309 (12)0.0312 (11)0.0065 (9)0.0081 (9)−0.0078 (9)
Cl2—C51.7679 (18)Cl3—C241.7669 (19)
Cl1—C51.7553 (19)Cl4—C241.757 (2)
O1—C121.213 (2)O2—C281.214 (2)
C7—C121.525 (2)C22—C281.520 (3)
C7—C61.529 (2)C22—C231.530 (2)
C7—C81.566 (2)C22—C211.566 (2)
C7—H71.0000C22—H221.0000
C6—C51.502 (3)C23—C241.496 (3)
C6—C41.538 (2)C23—C251.536 (2)
C6—H61.0000C23—H231.0000
C5—C41.507 (3)C24—C251.512 (3)
C4—C141.507 (3)C25—C301.511 (3)
C4—C31.516 (3)C25—C261.514 (3)
C3—C21.536 (3)C26—C271.534 (3)
C3—H3A0.9900C26—H26A0.9900
C3—H3B0.9900C26—H26B0.9900
C2—C11.557 (3)C27—C171.559 (3)
C2—H2A0.9900C27—H27A0.9900
C2—H2B0.9900C27—H27B0.9900
C1—C121.533 (3)C17—C281.524 (3)
C1—C111.538 (3)C17—C181.543 (3)
C1—C131.542 (3)C17—C291.548 (3)
C11—C101.536 (3)C18—C191.542 (3)
C11—H11A0.9900C18—H18A0.9900
C11—H11B0.9900C18—H18B0.9900
C10—C91.528 (3)C19—C201.520 (3)
C10—H10A0.9900C19—H19A0.9900
C10—H10B0.9900C19—H19B0.9900
C9—C81.534 (3)C20—C211.537 (3)
C9—H9A0.9900C20—H20A0.9900
C9—H9B0.9900C20—H20B0.9900
C8—C161.530 (3)C21—C321.533 (3)
C8—C151.532 (3)C21—C311.533 (3)
C14—H14A0.9800C30—H30A0.9800
C14—H14B0.9800C30—H30B0.9800
C14—H14C0.9800C30—H30C0.9800
C13—H13A0.9800C29—H29A0.9800
C13—H13B0.9800C29—H29B0.9800
C13—H13C0.9800C29—H29C0.9800
C16—H16A0.9800C32—H32A0.9800
C16—H16B0.9800C32—H32B0.9800
C16—H16C0.9800C32—H32C0.9800
C15—H15A0.9800C31—H31A0.9800
C15—H15B0.9800C31—H31B0.9800
C15—H15C0.9800C31—H31C0.9800
C12—C7—C6113.69 (15)C28—C22—C23115.15 (15)
C12—C7—C8111.45 (14)C28—C22—C21111.30 (14)
C6—C7—C8113.02 (14)C23—C22—C21112.01 (14)
C12—C7—H7106.0C28—C22—H22105.9
C6—C7—H7106.0C23—C22—H22105.9
C8—C7—H7106.0C21—C22—H22105.9
C5—C6—C7121.40 (15)C24—C23—C22121.73 (16)
C5—C6—C459.44 (12)C24—C23—C2559.80 (12)
C7—C6—C4124.80 (15)C22—C23—C25124.79 (15)
C5—C6—H6113.6C24—C23—H23113.4
C7—C6—H6113.6C22—C23—H23113.4
C4—C6—H6113.6C25—C23—H23113.4
C6—C5—C461.49 (12)C23—C24—C2561.44 (12)
C6—C5—Cl1119.70 (13)C23—C24—Cl4120.37 (13)
C4—C5—Cl1120.64 (13)C25—C24—Cl4120.24 (14)
C6—C5—Cl2118.54 (14)C23—C24—Cl3117.87 (13)
C4—C5—Cl2119.57 (13)C25—C24—Cl3120.13 (14)
Cl1—C5—Cl2109.78 (10)Cl4—C24—Cl3109.71 (11)
C14—C4—C5117.78 (16)C30—C25—C24117.93 (17)
C14—C4—C3114.32 (16)C30—C25—C26114.40 (16)
C5—C4—C3118.95 (16)C24—C25—C26118.76 (16)
C14—C4—C6117.05 (16)C30—C25—C23117.56 (16)
C5—C4—C659.06 (12)C24—C25—C2358.77 (12)
C3—C4—C6118.82 (15)C26—C25—C23118.41 (16)
C4—C3—C2114.24 (16)C25—C26—C27113.38 (16)
C4—C3—H3A108.7C25—C26—H26A108.9
C2—C3—H3A108.7C27—C26—H26A108.9
C4—C3—H3B108.7C25—C26—H26B108.9
C2—C3—H3B108.7C27—C26—H26B108.9
H3A—C3—H3B107.6H26A—C26—H26B107.7
C3—C2—C1115.69 (15)C26—C27—C17116.55 (16)
C3—C2—H2A108.4C26—C27—H27A108.2
C1—C2—H2A108.4C17—C27—H27A108.2
C3—C2—H2B108.4C26—C27—H27B108.2
C1—C2—H2B108.4C17—C27—H27B108.2
H2A—C2—H2B107.4H27A—C27—H27B107.3
C12—C1—C11113.36 (16)C28—C17—C18112.73 (15)
C12—C1—C13108.50 (16)C28—C17—C29108.98 (17)
C11—C1—C13109.14 (16)C18—C17—C29108.93 (17)
C12—C1—C2106.37 (15)C28—C17—C27107.26 (16)
C11—C1—C2110.02 (16)C18—C17—C27110.05 (16)
C13—C1—C2109.37 (16)C29—C17—C27108.80 (17)
C10—C11—C1116.28 (17)C19—C18—C17115.65 (17)
C10—C11—H11A108.2C19—C18—H18A108.4
C1—C11—H11A108.2C17—C18—H18A108.4
C10—C11—H11B108.2C19—C18—H18B108.4
C1—C11—H11B108.2C17—C18—H18B108.4
H11A—C11—H11B107.4H18A—C18—H18B107.4
C9—C10—C11113.05 (16)C20—C19—C18113.13 (17)
C9—C10—H10A109.0C20—C19—H19A109.0
C11—C10—H10A109.0C18—C19—H19A109.0
C9—C10—H10B109.0C20—C19—H19B109.0
C11—C10—H10B109.0C18—C19—H19B109.0
H10A—C10—H10B107.8H19A—C19—H19B107.8
C10—C9—C8117.89 (16)C19—C20—C21118.06 (16)
C10—C9—H9A107.8C19—C20—H20A107.8
C8—C9—H9A107.8C21—C20—H20A107.8
C10—C9—H9B107.8C19—C20—H20B107.8
C8—C9—H9B107.8C21—C20—H20B107.8
H9A—C9—H9B107.2H20A—C20—H20B107.1
C16—C8—C15108.00 (16)C32—C21—C31107.83 (16)
C16—C8—C9110.18 (16)C32—C21—C20108.17 (16)
C15—C8—C9107.78 (16)C31—C21—C20110.29 (16)
C16—C8—C7109.33 (15)C32—C21—C22107.76 (15)
C15—C8—C7107.83 (15)C31—C21—C22109.32 (15)
C9—C8—C7113.54 (14)C20—C21—C22113.29 (15)
O1—C12—C7119.24 (17)O2—C28—C22119.31 (17)
O1—C12—C1119.90 (17)O2—C28—C17120.21 (17)
C7—C12—C1120.83 (15)C22—C28—C17120.45 (15)
C4—C14—H14A109.5C25—C30—H30A109.5
C4—C14—H14B109.5C25—C30—H30B109.5
H14A—C14—H14B109.5H30A—C30—H30B109.5
C4—C14—H14C109.5C25—C30—H30C109.5
H14A—C14—H14C109.5H30A—C30—H30C109.5
H14B—C14—H14C109.5H30B—C30—H30C109.5
C1—C13—H13A109.5C17—C29—H29A109.5
C1—C13—H13B109.5C17—C29—H29B109.5
H13A—C13—H13B109.5H29A—C29—H29B109.5
C1—C13—H13C109.5C17—C29—H29C109.5
H13A—C13—H13C109.5H29A—C29—H29C109.5
H13B—C13—H13C109.5H29B—C29—H29C109.5
C8—C16—H16A109.5C21—C32—H32A109.5
C8—C16—H16B109.5C21—C32—H32B109.5
H16A—C16—H16B109.5H32A—C32—H32B109.5
C8—C16—H16C109.5C21—C32—H32C109.5
H16A—C16—H16C109.5H32A—C32—H32C109.5
H16B—C16—H16C109.5H32B—C32—H32C109.5
C8—C15—H15A109.5C21—C31—H31A109.5
C8—C15—H15B109.5C21—C31—H31B109.5
H15A—C15—H15B109.5H31A—C31—H31B109.5
C8—C15—H15C109.5C21—C31—H31C109.5
H15A—C15—H15C109.5H31A—C31—H31C109.5
H15B—C15—H15C109.5H31B—C31—H31C109.5
  2 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.  (1S,3S,8R,9S,11R)-10,10-Di-chloro-3,7,7,11-tetra-methyl-tetra-cyclo[6.5.0.0(1,3).0(9,11)]trideca-ne.

Authors:  Ahmed Benharref; Najia Ourhriss; Lahcen El Ammari; Mohamed Saadi; Moha Berraho
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2013-05-22
  2 in total

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