2α,8α-Diacet­oxy-cis-himachalane

Benharref, A.; Daran, J.C.; Berraho, M.

doi:10.1107/S160053681003727X

2α,8α-Diacetoxy-cis-himachalane

A. Benharref, J. C. Daran and M. Berraho

The title compound, C₁₉H₃₂O₄, was synthesized from γ-himachalene, wich was isolated from essential oils of Cedrus atlantica. The molecule is built up from two fused six- and seven-membered rings. The six-membered ring has a screw-boat conformation, whereas the seven-membered ring displays a half-chair conformation; the dihedral angle between the mean planes of the rings is 61.99 (6)°.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S160053681003727X/im2232sup1.cif Contains datablocks I, global
	Structure factor file (CIF format) https://doi.org/10.1107/S160053681003727X/im2232Isup2.hkl Contains datablock I

CCDC reference: 797807

checkCIF report

Key indicators

Single-crystal X-ray study
T = 180 K
Mean (C-C) = 0.002 Å
R factor = 0.030
wR factor = 0.079
Data-to-parameter ratio = 9.2

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) .....          4

Alert level G
REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is
            correct. If it is not, please give the correct count in the
            _publ_section_exptl_refinement section of the submitted CIF.
           From the CIF: _diffrn_reflns_theta_max           26.37
           From the CIF: _reflns_number_total               1976
           Count of symmetry unique reflns         1980
           Completeness (_total/calc)             99.80%
           TEST3: Check Friedels for noncentro structure
           Estimate of Friedel pairs measured         0
           Fraction of Friedel pairs measured     0.000
           Are heavy atom types Z>Si present         no
PLAT063_ALERT_4_G Crystal Size Likely too Large for Beam Size ....       0.75 mm
PLAT380_ALERT_4_G Check Incorrectly? Oriented X(sp2)-Methyl Moiety        C17
PLAT720_ALERT_4_G Number of Unusual/Non-Standard Labels ..........          1
PLAT791_ALERT_4_G Note: The Model has Chirality at C1     (Verify)          S
PLAT791_ALERT_4_G Note: The Model has Chirality at C2     (Verify)          R
PLAT791_ALERT_4_G Note: The Model has Chirality at C3     (Verify)          S
PLAT791_ALERT_4_G Note: The Model has Chirality at C6     (Verify)          R
PLAT791_ALERT_4_G Note: The Model has Chirality at C7     (Verify)          R
PLAT791_ALERT_4_G Note: The Model has Chirality at C8     (Verify)          R

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   1 ALERT level C = Check and explain
  10 ALERT level G = General alerts; check

   0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   0 ALERT type 2 Indicator that the structure model may be wrong or deficient
   1 ALERT type 3 Indicator that the structure quality may be low
  10 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

Comment top

This work is a part of our ongoing program concerning the valorization of the most abundant essential oils in Morocco, such as Cedrus atlantica. This oil is made up mainly (75%) of bicyclic sesquiterpene hydrocarbons, among which is found the compound γ- himachalene (Plattier & Teisseire, 1974). This compound is a minority product of the mixture of hydrocarbons of essential oil of the Atlas Cedar (Cedrus atlantica), isolated by Plattier et al. (1974). Literature provides only a few articles on the reactivity of this sesquiterpene, namely its hydrochlorination (Plattier & Teisseire, 1974), its hydroboration (Plattier et al., 1974) and its epoxidation (Chiaroni et al.,1996; Lassaba et al., 1998). Thus the action of two equivalents of diborane followed by oxidation with hydrogen peroxide and soda leads to two diasterioisomers: cis-himachal-2α,8α-diol and cis-himachal-2α,8β-diol. In order to prepare products with high added value, we have treated the mixture of these two isomers with the acetic anhydride in pyridine (see experimental) and obtained a mixture of two isomers (X) and (Y) with a combined yield of 98%. A study of spectral analysis of ¹H NMR, ¹³C NMR and mass spectrometry did not allow us to differentiate between the structures of both isomers. Nevertheless, a X-ray crystallographic study of a single-crystal of (X) has allowed its identification as 2α,8α-diacetoxy-cis-himachalane (Scheme 1) and distinguish it from its isomer (Y), which is 2α,8β-diacetoxy-cis-himachalane. The molecule (Fig.1) is built up from two fused six- and seven-membered rings with the acetoxy groups at positions 2 and 8 in α-configuration. The six-membered ring has a screw boat conformation as indicated by the total puckering amplitude QT = 0.7585 (12) Å and a spherical polar angle of θ= 92.06 (9)° with ϕ= 71.42 (9)°. The seven-membered ring displays a half chair conformation with QT =0.8062 (13) Å, θ = 42.17 (9)°, ϕ2 = -26.97 (14)° and ϕ3 = 169.95 (13)° (Cremer & Pople, 1975).

Related literature top

For background to γ-himachalene derivatives, see: Lassaba et al. (1998); Plattier & Teisseire (1974); Plattier et al. (1974). For a related structure, see: Chiaroni et al. (1996). For ring puckering analysis, see: Cremer & Pople (1975).

Experimental top

To a solution of 1 g of the mixture of two isomers of cis-himachal-2,8-diol (prepared from γ-himachalene) in 30 ml of pyridine was added 20 ml of acetic anhydride. The mixture is stirred overnight at room temperature, then treated with 100 ml of ice water. The reaction mixture was extracted three times with 30 ml of ether. The organic phases obtained are dried over sodium sulfate and then concentrated under vacuum. The residue obtained is chromatographed on silica gel column impregnated with silver nitrate (10%) with a mixture of hexane - ethyl acetate (95–5) used as eluent. The two diastereoisomers 2α,8α-diacetoxy-cis-himachalane (X) and 2α,8β-diacetoxy-cis-himachalane (Y) are obtained by this procedure in a 80/20 ratio and a combined yield of 98%. The title compound (isomer X) is recrystallized from a mixture of hexane and ethyle acetate (40/60).

Computing details top

Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell refinement: CrysAlis PRO (Oxford Diffraction, 2010); data reduction: CrysAlis PRO (Oxford Diffraction, 2010); program(s) used to solve structure: SIR2004 (Burla et al., 2005); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).

Figures top

Fig. 1. : Molecular structure of the title compound with the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. H atoms are represented as small spheres of arbitrary radii.

2α,8α-Diacetoxy-cis-himachalane top

Crystal data top

C₁₉H₃₂O₄	F(000) = 356
M_r = 324.45	D_x = 1.172 Mg m⁻³
Monoclinic, P2₁	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2yb	Cell parameters from 8181 reflections
a = 5.9316 (2) Å	θ = 3.5–29.2°
b = 11.7720 (3) Å	µ = 0.08 mm⁻¹
c = 13.3535 (4) Å	T = 180 K
β = 99.603 (3)°	Box, colourless
V = 919.37 (5) Å³	0.75 × 0.45 × 0.23 mm
Z = 2

Data collection top

Oxford Diffraction Xcalibur Eos Gemini Ultra diffractometer	1976 independent reflections
Radiation source: fine-focus sealed tube	1894 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.012
Detector resolution: 16.1978 pixels mm^-1	θ_max = 26.4°, θ_min = 3.5°
ω scans	h = −7→7
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010)	k = −14→14
T_min = 0.799, T_max = 1.000	l = 0→16
3681 measured reflections

Refinement top

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)] = 0.030	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.079	H-atom parameters constrained
S = 1.06	w = 1/[σ²(F_o²) + (0.0489P)² + 0.0959P] where P = (F_o² + 2F_c²)/3
1976 reflections	(Δ/σ)_max < 0.001
214 parameters	Δρ_max = 0.17 e Å⁻³
1 restraint	Δρ_min = −0.14 e Å⁻³

Crystal data top

C₁₉H₃₂O₄	V = 919.37 (5) Å³
M_r = 324.45	Z = 2
Monoclinic, P2₁	Mo Kα radiation
a = 5.9316 (2) Å	µ = 0.08 mm⁻¹
b = 11.7720 (3) Å	T = 180 K
c = 13.3535 (4) Å	0.75 × 0.45 × 0.23 mm
β = 99.603 (3)°

Data collection top

Oxford Diffraction Xcalibur Eos Gemini Ultra diffractometer	1976 independent reflections
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010)	1894 reflections with I > 2σ(I)
T_min = 0.799, T_max = 1.000	R_int = 0.012
3681 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.030	1 restraint
wR(F²) = 0.079	H-atom parameters constrained
S = 1.06	Δρ_max = 0.17 e Å⁻³
1976 reflections	Δρ_min = −0.14 e Å⁻³
214 parameters

Special details top

Experimental. Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. CrysAlisPro (Oxford Diffraction 2010)

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
C1	0.0099 (3)	0.89742 (14)	0.20021 (12)	0.0220 (3)
H1	0.1630	0.8831	0.1845	0.026*
C2	−0.1412 (3)	0.92089 (14)	0.09491 (12)	0.0245 (3)
H2	−0.2622	0.8634	0.0827	0.029*
C3	−0.2509 (3)	1.03856 (15)	0.08423 (12)	0.0270 (4)
H3	−0.1305	1.0954	0.0833	0.032*
C4	−0.3655 (3)	1.05982 (16)	0.17728 (13)	0.0286 (4)
H4A	−0.4791	1.0013	0.1805	0.034*
H4B	−0.4441	1.1323	0.1694	0.034*
C5	−0.1940 (3)	1.06035 (16)	0.27780 (12)	0.0271 (4)
H5A	−0.1699	1.1378	0.3020	0.033*
H5B	−0.2567	1.0173	0.3287	0.033*
C6	0.0352 (3)	1.00838 (14)	0.26315 (12)	0.0226 (3)
H6	0.0943	1.0628	0.2183	0.027*
C7	0.2205 (3)	1.00777 (15)	0.35903 (12)	0.0254 (3)
H7	0.3489	0.9630	0.3427	0.030*
C8	0.1503 (3)	0.95438 (17)	0.45333 (12)	0.0289 (4)
H8	0.0556	1.0087	0.4834	0.035*
C9	0.0274 (3)	0.84093 (19)	0.44034 (13)	0.0354 (4)
H9A	−0.1359	0.8555	0.4284	0.042*
H9B	0.0630	0.7996	0.5038	0.042*
C10	0.0816 (3)	0.76424 (16)	0.35535 (13)	0.0311 (4)
H10A	0.0590	0.6861	0.3744	0.037*
H10B	0.2424	0.7731	0.3512	0.037*
C11	−0.0575 (3)	0.78409 (15)	0.24849 (13)	0.0253 (3)
C12	−0.4260 (3)	1.05045 (19)	−0.01273 (14)	0.0386 (4)
H12A	−0.3562	1.0307	−0.0703	0.058*
H12B	−0.4794	1.1275	−0.0195	0.058*
H12C	−0.5527	1.0006	−0.0095	0.058*
C13	0.3102 (3)	1.12841 (17)	0.38390 (15)	0.0341 (4)
H13	0.1879	1.1755	0.3989	0.051*
H13A	0.3684	1.1590	0.3267	0.051*
H13B	0.4303	1.1262	0.4417	0.051*
C14	−0.3141 (3)	0.77332 (17)	0.25420 (14)	0.0307 (4)
H14A	−0.4009	0.7725	0.1867	0.046*
H14B	−0.3609	0.8367	0.2911	0.046*
H14C	−0.3404	0.7040	0.2883	0.046*
C15	0.0020 (3)	0.68616 (16)	0.18139 (14)	0.0331 (4)
H15A	−0.0356	0.6151	0.2097	0.050*
H15B	0.1625	0.6880	0.1784	0.050*
H15C	−0.0838	0.6942	0.1142	0.050*
C16	−0.0647 (3)	0.84124 (16)	−0.06239 (13)	0.0300 (4)
C17	0.1060 (4)	0.84018 (18)	−0.13319 (14)	0.0380 (4)
H17A	0.2502	0.8131	−0.0978	0.057*
H17B	0.1242	0.9158	−0.1576	0.057*
H17C	0.0531	0.7910	−0.1896	0.057*
C18	0.3634 (3)	0.95040 (18)	0.62200 (13)	0.0362 (4)
C19	0.5969 (4)	0.9380 (2)	0.68344 (16)	0.0516 (6)
H19A	0.5892	0.8902	0.7410	0.077*
H19B	0.6542	1.0114	0.7064	0.077*
H19C	0.6974	0.9044	0.6424	0.077*
O1	0.0055 (2)	0.90900 (10)	0.01763 (9)	0.0275 (3)
O2	−0.2420 (3)	0.78940 (14)	−0.07569 (10)	0.0456 (4)
O3	0.3679 (2)	0.93985 (13)	0.52241 (9)	0.0338 (3)
O4	0.1927 (3)	0.96866 (19)	0.65590 (11)	0.0572 (5)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0175 (7)	0.0237 (8)	0.0255 (7)	−0.0015 (6)	0.0060 (6)	−0.0003 (7)
C2	0.0232 (7)	0.0266 (9)	0.0246 (8)	−0.0040 (6)	0.0071 (6)	−0.0009 (6)
C3	0.0260 (8)	0.0290 (9)	0.0267 (8)	0.0013 (7)	0.0066 (6)	0.0031 (7)
C4	0.0235 (8)	0.0306 (9)	0.0330 (9)	0.0040 (7)	0.0084 (6)	0.0037 (8)
C5	0.0252 (8)	0.0301 (9)	0.0280 (8)	0.0020 (7)	0.0100 (6)	−0.0012 (7)
C6	0.0217 (7)	0.0240 (8)	0.0236 (7)	−0.0017 (6)	0.0081 (6)	0.0001 (6)
C7	0.0220 (8)	0.0302 (9)	0.0250 (8)	−0.0013 (7)	0.0073 (6)	−0.0035 (7)
C8	0.0249 (8)	0.0396 (10)	0.0230 (8)	0.0014 (8)	0.0060 (6)	−0.0020 (8)
C9	0.0334 (9)	0.0472 (11)	0.0267 (9)	−0.0070 (9)	0.0089 (7)	0.0054 (9)
C10	0.0305 (8)	0.0294 (9)	0.0333 (9)	−0.0020 (7)	0.0052 (7)	0.0067 (8)
C11	0.0228 (7)	0.0239 (8)	0.0293 (8)	−0.0013 (7)	0.0050 (6)	0.0015 (7)
C12	0.0380 (10)	0.0430 (11)	0.0326 (9)	0.0067 (9)	−0.0009 (7)	0.0047 (9)
C13	0.0315 (9)	0.0360 (10)	0.0360 (10)	−0.0064 (8)	0.0092 (7)	−0.0082 (8)
C14	0.0253 (8)	0.0303 (9)	0.0371 (9)	−0.0061 (7)	0.0066 (7)	0.0048 (8)
C15	0.0358 (9)	0.0248 (9)	0.0388 (10)	−0.0002 (7)	0.0066 (8)	−0.0002 (8)
C16	0.0406 (9)	0.0248 (8)	0.0236 (8)	−0.0001 (8)	0.0027 (7)	0.0002 (7)
C17	0.0534 (12)	0.0319 (10)	0.0309 (9)	0.0023 (9)	0.0133 (8)	−0.0034 (8)
C18	0.0507 (11)	0.0320 (10)	0.0248 (8)	−0.0009 (9)	0.0034 (8)	−0.0017 (8)
C19	0.0615 (14)	0.0486 (13)	0.0372 (11)	−0.0010 (11)	−0.0137 (9)	−0.0020 (10)
O1	0.0289 (6)	0.0309 (7)	0.0242 (6)	−0.0041 (5)	0.0086 (5)	−0.0040 (5)
O2	0.0528 (8)	0.0469 (9)	0.0364 (7)	−0.0179 (7)	0.0053 (6)	−0.0092 (7)
O3	0.0298 (6)	0.0464 (8)	0.0246 (6)	0.0022 (6)	0.0024 (5)	−0.0034 (6)
O4	0.0629 (10)	0.0831 (13)	0.0278 (7)	0.0126 (10)	0.0140 (7)	−0.0011 (8)

Geometric parameters (Å, º) top

C1—C6	1.547 (2)	C10—H10A	0.9700
C1—C2	1.561 (2)	C10—H10B	0.9700
C1—C11	1.562 (2)	C11—C15	1.537 (3)
C1—H1	0.9800	C11—C14	1.542 (2)
C2—O1	1.4632 (19)	C12—H12A	0.9600
C2—C3	1.527 (2)	C12—H12B	0.9600
C2—H2	0.9800	C12—H12C	0.9600
C3—C12	1.525 (2)	C13—H13	0.9600
C3—C4	1.533 (2)	C13—H13A	0.9600
C3—H3	0.9800	C13—H13B	0.9600
C4—C5	1.543 (2)	C14—H14A	0.9600
C4—H4A	0.9700	C14—H14B	0.9600
C4—H4B	0.9700	C14—H14C	0.9600
C5—C6	1.533 (2)	C15—H15A	0.9600
C5—H5A	0.9700	C15—H15B	0.9600
C5—H5B	0.9700	C15—H15C	0.9600
C6—C7	1.542 (2)	C16—O2	1.203 (2)
C6—H6	0.9800	C16—O1	1.343 (2)
C7—C8	1.526 (2)	C16—C17	1.496 (3)
C7—C13	1.533 (3)	C17—H17A	0.9600
C7—H7	0.9800	C17—H17B	0.9600
C8—O3	1.466 (2)	C17—H17C	0.9600
C8—C9	1.518 (3)	C18—O4	1.195 (2)
C8—H8	0.9800	C18—O3	1.340 (2)
C9—C10	1.526 (3)	C18—C19	1.495 (3)
C9—H9A	0.9700	C19—H19A	0.9600
C9—H9B	0.9700	C19—H19B	0.9600
C10—C11	1.542 (2)	C19—H19C	0.9600

C6—C1—C2	109.21 (13)	C9—C10—H10A	108.1
C6—C1—C11	120.34 (13)	C11—C10—H10A	108.1
C2—C1—C11	112.02 (13)	C9—C10—H10B	108.1
C6—C1—H1	104.6	C11—C10—H10B	108.1
C2—C1—H1	104.6	H10A—C10—H10B	107.3
C11—C1—H1	104.6	C15—C11—C14	106.96 (14)
O1—C2—C3	108.37 (13)	C15—C11—C10	106.64 (14)
O1—C2—C1	107.38 (12)	C14—C11—C10	108.78 (14)
C3—C2—C1	114.61 (14)	C15—C11—C1	107.49 (13)
O1—C2—H2	108.8	C14—C11—C1	114.41 (14)
C3—C2—H2	108.8	C10—C11—C1	112.14 (14)
C1—C2—H2	108.8	C3—C12—H12A	109.5
C12—C3—C2	112.44 (15)	C3—C12—H12B	109.5
C12—C3—C4	109.97 (14)	H12A—C12—H12B	109.5
C2—C3—C4	108.18 (14)	C3—C12—H12C	109.5
C12—C3—H3	108.7	H12A—C12—H12C	109.5
C2—C3—H3	108.7	H12B—C12—H12C	109.5
C4—C3—H3	108.7	C7—C13—H13	109.5
C3—C4—C5	112.86 (13)	C7—C13—H13A	109.5
C3—C4—H4A	109.0	H13—C13—H13A	109.5
C5—C4—H4A	109.0	C7—C13—H13B	109.5
C3—C4—H4B	109.0	H13—C13—H13B	109.5
C5—C4—H4B	109.0	H13A—C13—H13B	109.5
H4A—C4—H4B	107.8	C11—C14—H14A	109.5
C6—C5—C4	110.94 (13)	C11—C14—H14B	109.5
C6—C5—H5A	109.5	H14A—C14—H14B	109.5
C4—C5—H5A	109.5	C11—C14—H14C	109.5
C6—C5—H5B	109.5	H14A—C14—H14C	109.5
C4—C5—H5B	109.5	H14B—C14—H14C	109.5
H5A—C5—H5B	108.0	C11—C15—H15A	109.5
C5—C6—C7	114.85 (13)	C11—C15—H15B	109.5
C5—C6—C1	113.48 (13)	H15A—C15—H15B	109.5
C7—C6—C1	116.00 (13)	C11—C15—H15C	109.5
C5—C6—H6	103.4	H15A—C15—H15C	109.5
C7—C6—H6	103.4	H15B—C15—H15C	109.5
C1—C6—H6	103.4	O2—C16—O1	124.46 (16)
C8—C7—C13	109.58 (15)	O2—C16—C17	124.71 (17)
C8—C7—C6	115.63 (13)	O1—C16—C17	110.82 (15)
C13—C7—C6	110.43 (14)	C16—C17—H17A	109.5
C8—C7—H7	106.9	C16—C17—H17B	109.5
C13—C7—H7	106.9	H17A—C17—H17B	109.5
C6—C7—H7	106.9	C16—C17—H17C	109.5
O3—C8—C9	108.97 (15)	H17A—C17—H17C	109.5
O3—C8—C7	103.58 (13)	H17B—C17—H17C	109.5
C9—C8—C7	117.39 (14)	O4—C18—O3	123.42 (18)
O3—C8—H8	108.9	O4—C18—C19	125.14 (18)
C9—C8—H8	108.9	O3—C18—C19	111.43 (18)
C7—C8—H8	108.9	C18—C19—H19A	109.5
C8—C9—C10	116.66 (15)	C18—C19—H19B	109.5
C8—C9—H9A	108.1	H19A—C19—H19B	109.5
C10—C9—H9A	108.1	C18—C19—H19C	109.5
C8—C9—H9B	108.1	H19A—C19—H19C	109.5
C10—C9—H9B	108.1	H19B—C19—H19C	109.5
H9A—C9—H9B	107.3	C16—O1—C2	118.45 (13)
C9—C10—C11	116.86 (15)	C18—O3—C8	116.89 (14)

Experimental details

Crystal data
Chemical formula	C₁₉H₃₂O₄
M_r	324.45
Crystal system, space group	Monoclinic, P2₁
Temperature (K)	180
a, b, c (Å)	5.9316 (2), 11.7720 (3), 13.3535 (4)
β (°)	99.603 (3)
V (Å³)	919.37 (5)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	0.08
Crystal size (mm)	0.75 × 0.45 × 0.23

Data collection
Diffractometer	Oxford Diffraction Xcalibur Eos Gemini Ultra diffractometer
Absorption correction	Multi-scan (CrysAlis PRO; Oxford Diffraction, 2010)
T_min, T_max	0.799, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	3681, 1976, 1894
R_int	0.012
(sin θ/λ)_max (Å⁻¹)	0.625

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.030, 0.079, 1.06
No. of reflections	1976
No. of parameters	214
No. of restraints	1
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.17, −0.14

Computer programs: CrysAlis PRO (Oxford Diffraction, 2010), SIR2004 (Burla et al., 2005), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999).

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2α,8α-Diacet­oxy-cis-himachalane

Supporting information

Key indicators

checkCIF/PLATON results

2α,8α-Diacetoxy-cis-himachalane