Isopropyl 2,2-bis­(4-bromo­phen­yl)-2-hy­droxy­acetate

Smith, G.

doi:10.1107/S1600536812044571

Isopropyl 2,2-bis(4-bromophenyl)-2-hydroxyacetate

The title compound, C₁₇H₁₆Br₂O₃, which is a restricted commercial acaricide (common name bromopropylate), has two independent and conformationally similar molecules in the asymmetric unit [dihedral angles between the planes of the two phenyl rings = 68.7 (4) and 77.4 (5)°]. The C atoms of the isopropyl group of one of the molecules are disordered over two sites with occupancies of 0.638 (16) and 0.362 (16). Minor non-merohedral twinning was also present in the crystal. Intermolecular O—H

O hydrogen-bonding interactions involving the hydroxy groups and carboxyl O-atom acceptors give separate centrosymmetric homodimers through cyclic hydrogen-bonding motifs [graph set R₂²(10)].

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536812044571/sj5277sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536812044571/sj5277Isup2.hkl Contains datablock I
	Chemical Markup Language (CML) file https://doi.org/10.1107/S1600536812044571/sj5277Isup3.cml Supplementary material

CCDC reference: 914280

checkCIF report

Key indicators

Single-crystal X-ray study
T = 200 K
Mean (C-C) = 0.010 Å
Disorder in main residue
R factor = 0.055
wR factor = 0.156
Data-to-parameter ratio = 16.2

checkCIF/PLATON results

No syntax errors found



Alert level B
PLAT910_ALERT_3_B Missing # of FCF Reflections Below Th(Min) .....         12
PLAT934_ALERT_3_B Number of (Iobs-Icalc)/SigmaW .gt. 10 Outliers .          5

Alert level C
PLAT220_ALERT_2_C Large Non-Solvent    C     Ueq(max)/Ueq(min) ...        3.3 Ratio
PLAT234_ALERT_4_C Large Hirshfeld Difference C31A   --  C51A    ..       0.17 Ang.
PLAT341_ALERT_3_C Low Bond Precision on  C-C Bonds ...............     0.0098 Ang
PLAT906_ALERT_3_C Large K value in the Analysis of Variance ......      3.649
PLAT918_ALERT_3_C Reflection(s) # with I(obs) much smaller I(calc)          2

Alert level G
PLAT005_ALERT_5_G No _iucr_refine_instructions_details  in CIF ...          ?
PLAT007_ALERT_5_G Note: Number of Unrefined D-H Atoms ............          2
PLAT083_ALERT_2_G SHELXL Second Parameter in WGHT Unusually Large.       8.71
PLAT242_ALERT_2_G Check Low       Ueq as Compared to Neighbors for       C31A
PLAT242_ALERT_2_G Check Low       Ueq as Compared to Neighbors for       C31E
PLAT301_ALERT_3_G Note: Main Residue  Disorder ...................          7 Perc.
PLAT870_ALERT_4_G ALERTS Related to Twinning Effects Suppressed ..          !
PLAT931_ALERT_5_G Check Twin Law ( 0 0  1)[       ] Estimated BASF       0.13

   0 ALERT level A = Most likely a serious problem - resolve or explain
   2 ALERT level B = A potentially serious problem, consider carefully
   5 ALERT level C = Check. Ensure it is not caused by an omission or oversight
   8 ALERT level G = General information/check it is not something unexpected

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

Comment top

The title compound C₁₇H₁₆Br₂O₃, (common name bromopropylate) is the isopropyl ester of 4,4'-dibromobenzilic acid and is available for limited commercial use as a contact acaricide (Acarol, Neorol) (O'Neil, 2001). The structure of benzilic acid (Qui et al., 2007) and its 1-methylpiperidin-4-yl ester (Fu et al., 2006) have previously been reported.

In the structure of the title compound there are two independent and conformationally similar molecules in the asymmetric unit (Figs. 1, 2). The dihedral angles between the planes of the two phenyl rings in these molecules are 68.7 (4) and 77.4 (5)°. However, in one of the molecules the isopropyl group is disordered over two separate sites [C31A, C41A, C51A [S.O.F = 0.638 (16)] and C31E, C41E, C51E [S.O.F. = 0.362 (16)]. Minor non-merohedral twinning was also present in the crystal. Intermolecular hydrogen-bonding interactions involving the hydroxy groups and carboxyl O-atom acceptors (Table 1) give separate centrosymmetric homodimers through cyclic motifs [graph set R²₂(10) (Etter et al., 1990)] (Fig. 3). Other intramolecular aromatic C—H···O interactions are also present in the dimers as well as relatively short intermolecular Br···O interactions [Br4B···O11Aⁱⁱⁱ, 3.348 (4) Å; Br4C···O11Cⁱⁱⁱ, 3.389 (4) Å [for symmetry code (iii), x-1, y, z].

Related literature top

For background information on bromopropylate, see: O'Neil (2001). For the structures of benzilic acid and an analogous benzilate ester, see: Qui et al. (2007); Fu et al. (2006). For graph-set analysis, see: Etter et al. (1990).

Experimental top

The title compound bromopropylate was obtained as an analytical reference standard from the U.S. Environmental Protection Agency. Colourless crystal plates suitable for X-ray analysis were obtained by room temperature evaporation of a solution in ethanol.

Computing details top

Data collection: CrysAlis PRO (Agilent, 2012); cell refinement: CrysAlis PRO (Agilent, 2012); data reduction: CrysAlis PRO (Agilent, 2012); program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 1999); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: PLATON (Spek, 2009).

Figures top

	Fig. 1. Molecular conformation and atom numbering scheme for molecule 1 of the two independent molecules in the asymmetric unit of the title compound, including the C atoms (C31E, C41E, C51E) of the disordered isopropyl group. Displacement ellipsoids are drawn at the 40% probability level.
	Fig. 2. Molecular conformation and atom numbering scheme for the second molecule in the asymmetric unit of the title compound, with displacement ellipsoids drawn at the 40% probability level.
	Fig. 3. A perspective view of the two hydrogen-bonded homodimeric units in the unit cell, viewed along a. The minor disorder component of the isopropyl group of the first molecule is not shown.

Isopropyl 2,2-bis(4-bromophenyl)-2-hydroxyacetate top

Crystal data top

C₁₇H₁₆Br₂O₃	Z = 4
M_r = 428.10	F(000) = 848
Triclinic, P1	D_x = 1.686 Mg m⁻³
Hall symbol: -P 1	Melting point: 350 K
a = 10.2036 (6) Å	Mo Kα radiation, λ = 0.71073 Å
b = 10.2166 (6) Å	Cell parameters from 5077 reflections
c = 17.6687 (13) Å	θ = 3.1–28.9°
α = 83.775 (5)°	µ = 4.82 mm⁻¹
β = 73.346 (6)°	T = 200 K
γ = 72.937 (5)°	Block, colourless
V = 1686.4 (2) Å³	0.30 × 0.20 × 0.12 mm

Data collection top

Oxford Diffraction Gemini-S CCD-detector diffractometer	6627 independent reflections
Radiation source: Enhance (Mo) X-ray source	5435 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.048
Detector resolution: 16.077 pixels mm^-1	θ_max = 26.0°, θ_min = 3.1°
ω scans	h = −12→12
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2012)	k = −12→12
T_min = 0.581, T_max = 0.980	l = −21→21
21160 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)] = 0.055	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.156	H-atom parameters constrained
S = 1.08	w = 1/[σ²(F_o²) + (0.0571P)² + 8.7092P] where P = (F_o² + 2F_c²)/3
6627 reflections	(Δ/σ)_max = 0.002
408 parameters	Δρ_max = 1.20 e Å⁻³
0 restraints	Δρ_min = −1.14 e Å⁻³

Crystal data top

C₁₇H₁₆Br₂O₃	γ = 72.937 (5)°
M_r = 428.10	V = 1686.4 (2) Å³
Triclinic, P1	Z = 4
a = 10.2036 (6) Å	Mo Kα radiation
b = 10.2166 (6) Å	µ = 4.82 mm⁻¹
c = 17.6687 (13) Å	T = 200 K
α = 83.775 (5)°	0.30 × 0.20 × 0.12 mm
β = 73.346 (6)°

Data collection top

Oxford Diffraction Gemini-S CCD-detector diffractometer	6627 independent reflections
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2012)	5435 reflections with I > 2σ(I)
T_min = 0.581, T_max = 0.980	R_int = 0.048
21160 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.055	0 restraints
wR(F²) = 0.156	H-atom parameters constrained
S = 1.08	Δρ_max = 1.20 e Å⁻³
6627 reflections	Δρ_min = −1.14 e Å⁻³
408 parameters

Special details top

Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles

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	Occ. (<1)
Br4A	0.89518 (9)	1.30205 (7)	0.27385 (4)	0.0459 (3)
Br4B	0.30004 (9)	0.64421 (10)	0.40830 (5)	0.0564 (3)
O11A	0.9752 (4)	0.6496 (4)	0.3992 (2)	0.0296 (12)
O21A	0.7448 (6)	0.8256 (5)	0.5730 (3)	0.0483 (18)
O22A	0.9228 (6)	0.6320 (5)	0.5558 (3)	0.0418 (17)
C1A	0.8626 (6)	0.8855 (6)	0.4047 (3)	0.0237 (17)
C1B	0.7154 (7)	0.7172 (6)	0.4347 (3)	0.0267 (17)
C2A	0.8808 (7)	0.9874 (7)	0.4424 (4)	0.0324 (19)
C2B	0.5880 (8)	0.8199 (7)	0.4497 (5)	0.043 (3)
C3A	0.8907 (7)	1.1118 (7)	0.4037 (4)	0.034 (2)
C3B	0.4654 (8)	0.7966 (8)	0.4439 (5)	0.045 (3)
C4A	0.8842 (7)	1.1319 (6)	0.3272 (4)	0.0281 (17)
C4B	0.4695 (8)	0.6706 (8)	0.4218 (4)	0.040 (3)
C5A	0.8678 (8)	1.0319 (7)	0.2868 (4)	0.038 (2)
C5B	0.5937 (8)	0.5666 (7)	0.4060 (4)	0.036 (2)
C6A	0.8579 (8)	0.9096 (7)	0.3262 (4)	0.036 (2)
C6B	0.7167 (8)	0.5900 (7)	0.4130 (4)	0.035 (2)
C11A	0.8518 (6)	0.7449 (6)	0.4404 (4)	0.0260 (17)
C21A	0.8464 (7)	0.7282 (6)	0.5296 (4)	0.0310 (19)
C31A	0.7366 (17)	0.8166 (16)	0.6594 (8)	0.040 (4)	0.638 (16)
C41A	0.719 (3)	0.9601 (19)	0.6863 (12)	0.056 (6)	0.638 (16)
C51A	0.609 (2)	0.7606 (19)	0.6920 (10)	0.079 (7)	0.638 (16)
C51E	0.525 (4)	0.828 (4)	0.6798 (19)	0.079 (7)	0.362 (16)
C31E	0.675 (3)	0.802 (3)	0.6601 (17)	0.040 (4)	0.362 (16)
C41E	0.723 (5)	0.904 (4)	0.697 (2)	0.056 (6)	0.362 (16)
Br4C	0.18617 (7)	0.14249 (8)	0.07253 (5)	0.0447 (3)
Br4D	0.66910 (9)	0.77309 (7)	0.21608 (4)	0.0419 (2)
O11C	0.8480 (4)	0.1314 (4)	0.0961 (2)	0.0261 (12)
O21C	0.8124 (4)	0.3361 (4)	−0.0781 (2)	0.0285 (12)
O22C	0.9644 (5)	0.1328 (4)	−0.0599 (2)	0.0317 (12)
C1C	0.6305 (6)	0.2050 (6)	0.0518 (3)	0.0208 (17)
C1D	0.7444 (6)	0.3692 (6)	0.0908 (3)	0.0208 (17)
C2C	0.5973 (7)	0.0877 (6)	0.0871 (3)	0.0260 (17)
C2D	0.8500 (7)	0.4364 (6)	0.0735 (4)	0.0282 (17)
C3C	0.4664 (7)	0.0675 (6)	0.0915 (4)	0.0288 (17)
C3D	0.8284 (7)	0.5557 (6)	0.1114 (4)	0.0300 (17)
C4C	0.3697 (7)	0.1655 (7)	0.0614 (4)	0.0302 (17)
C4D	0.7019 (7)	0.6066 (6)	0.1669 (3)	0.0272 (19)
C5C	0.4017 (7)	0.2818 (7)	0.0237 (4)	0.034 (2)
C5D	0.5988 (7)	0.5403 (6)	0.1858 (4)	0.0301 (17)
C6C	0.5316 (7)	0.3007 (6)	0.0177 (4)	0.0298 (19)
C6D	0.6194 (7)	0.4215 (6)	0.1476 (4)	0.0296 (17)
C11C	0.7712 (6)	0.2330 (6)	0.0516 (3)	0.0231 (17)
C21C	0.8619 (6)	0.2286 (6)	−0.0351 (3)	0.0222 (17)
C31C	0.8718 (7)	0.3287 (7)	−0.1646 (4)	0.0315 (19)
C41C	0.8017 (9)	0.2421 (9)	−0.1959 (5)	0.050 (3)
C51C	0.8390 (10)	0.4762 (8)	−0.1954 (4)	0.054 (3)
H2A	0.88650	0.97300	0.49440	0.0390*
H5A	0.86360	1.04660	0.23460	0.0460*
H5B	0.59530	0.48160	0.39090	0.0430*
H6A	0.84780	0.84100	0.29960	0.0430*
H6B	0.80110	0.51980	0.40300	0.0420*
H11A	0.99300	0.56760	0.42950	0.0440*
H31A	0.82220	0.75160	0.66950	0.0480*	0.638 (16)
H41A	0.80580	0.98550	0.66400	0.0850*	0.638 (16)
H42A	0.69670	0.95970	0.74300	0.0850*	0.638 (16)
H43A	0.64300	1.02480	0.66900	0.0850*	0.638 (16)
H51A	0.62890	0.67200	0.67090	0.1190*	0.638 (16)
H52A	0.52790	0.82160	0.67720	0.1190*	0.638 (16)
H53A	0.58790	0.75290	0.74860	0.1190*	0.638 (16)
H2B	0.58560	0.90580	0.46400	0.0520*
H3A	0.90180	1.18050	0.42980	0.0400*
H3B	0.38020	0.86580	0.45490	0.0550*
H31E	0.71740	0.70820	0.67680	0.0480*	0.362 (16)
H41E	0.82480	0.87560	0.68620	0.0850*	0.362 (16)
H42E	0.68060	0.90620	0.75260	0.0850*	0.362 (16)
H43E	0.69380	0.99360	0.67350	0.0850*	0.362 (16)
H51E	0.50110	0.75290	0.66420	0.1190*	0.362 (16)
H52E	0.48540	0.91050	0.65260	0.1190*	0.362 (16)
H53E	0.48630	0.83940	0.73580	0.1190*	0.362 (16)
H2C	0.66290	0.02170	0.10820	0.0310*
H2D	0.93580	0.40110	0.03620	0.0340*
H3C	0.44480	−0.01240	0.11480	0.0350*
H3D	0.89900	0.60100	0.09940	0.0360*
H5C	0.33570	0.34700	0.00250	0.0410*
H5D	0.51450	0.57450	0.22430	0.0360*
H6C	0.55480	0.37770	−0.00930	0.0350*
H6D	0.54840	0.37670	0.16030	0.0350*
H11C	0.86350	0.05570	0.07840	0.0390*
H31C	0.97500	0.28740	−0.17760	0.0440*
H41C	0.82590	0.15020	−0.17490	0.0750*
H42C	0.83450	0.24110	−0.25250	0.0750*
H43C	0.70030	0.28010	−0.18010	0.0750*
H51C	0.88640	0.52610	−0.17430	0.0810*
H52C	0.73820	0.51770	−0.17930	0.0810*
H53C	0.87170	0.47810	−0.25200	0.0810*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Br4A	0.0662 (5)	0.0316 (4)	0.0400 (4)	−0.0165 (3)	−0.0145 (4)	0.0082 (3)
Br4B	0.0428 (4)	0.0875 (7)	0.0494 (5)	−0.0334 (4)	−0.0163 (4)	0.0080 (4)
O11A	0.028 (2)	0.030 (2)	0.023 (2)	−0.0009 (18)	−0.0006 (18)	−0.0052 (17)
O21A	0.067 (4)	0.035 (3)	0.019 (2)	0.010 (2)	0.000 (2)	0.0008 (19)
O22A	0.054 (3)	0.034 (3)	0.033 (3)	0.002 (2)	−0.020 (2)	0.001 (2)
C1A	0.021 (3)	0.030 (3)	0.016 (3)	−0.003 (2)	−0.003 (2)	0.000 (2)
C1B	0.028 (3)	0.029 (3)	0.019 (3)	−0.007 (3)	−0.001 (3)	0.000 (2)
C2A	0.043 (4)	0.035 (3)	0.025 (3)	−0.014 (3)	−0.015 (3)	0.000 (3)
C2B	0.032 (4)	0.035 (4)	0.056 (5)	0.001 (3)	−0.007 (3)	−0.013 (3)
C3A	0.044 (4)	0.034 (4)	0.031 (3)	−0.017 (3)	−0.015 (3)	−0.003 (3)
C3B	0.026 (4)	0.054 (5)	0.049 (5)	−0.003 (3)	−0.005 (3)	−0.007 (4)
C4A	0.035 (3)	0.024 (3)	0.027 (3)	−0.009 (3)	−0.011 (3)	0.002 (2)
C4B	0.038 (4)	0.057 (5)	0.031 (4)	−0.024 (3)	−0.013 (3)	0.013 (3)
C5A	0.055 (5)	0.041 (4)	0.022 (3)	−0.014 (3)	−0.014 (3)	−0.001 (3)
C5B	0.043 (4)	0.033 (4)	0.037 (4)	−0.016 (3)	−0.015 (3)	0.004 (3)
C6A	0.058 (5)	0.032 (3)	0.023 (3)	−0.017 (3)	−0.015 (3)	−0.003 (3)
C6B	0.039 (4)	0.028 (3)	0.038 (4)	−0.011 (3)	−0.010 (3)	0.006 (3)
C11A	0.025 (3)	0.024 (3)	0.024 (3)	0.000 (2)	−0.005 (3)	−0.003 (2)
C21A	0.040 (4)	0.020 (3)	0.030 (3)	−0.006 (3)	−0.007 (3)	−0.001 (2)
C31A	0.041 (10)	0.043 (6)	0.018 (4)	−0.004 (7)	0.007 (7)	0.010 (4)
C41A	0.080 (8)	0.061 (14)	0.020 (7)	−0.016 (12)	−0.007 (6)	0.004 (9)
C51A	0.097 (15)	0.070 (12)	0.052 (8)	−0.030 (9)	0.012 (9)	0.011 (8)
C51E	0.097 (15)	0.070 (12)	0.052 (8)	−0.030 (9)	0.012 (9)	0.011 (8)
C31E	0.041 (10)	0.043 (6)	0.018 (4)	−0.004 (7)	0.007 (7)	0.010 (4)
C41E	0.080 (8)	0.061 (14)	0.020 (7)	−0.016 (12)	−0.007 (6)	0.004 (9)
Br4C	0.0290 (4)	0.0519 (5)	0.0557 (5)	−0.0159 (3)	−0.0076 (3)	−0.0092 (3)
Br4D	0.0655 (5)	0.0264 (3)	0.0359 (4)	−0.0129 (3)	−0.0150 (4)	−0.0055 (3)
O11C	0.030 (2)	0.022 (2)	0.026 (2)	−0.0013 (17)	−0.0136 (19)	0.0005 (16)
O21C	0.031 (2)	0.027 (2)	0.020 (2)	0.0001 (18)	−0.0045 (18)	0.0013 (17)
O22C	0.033 (2)	0.029 (2)	0.026 (2)	−0.0002 (19)	−0.0057 (19)	−0.0008 (18)
C1C	0.024 (3)	0.020 (3)	0.018 (3)	−0.005 (2)	−0.006 (2)	−0.001 (2)
C1D	0.022 (3)	0.021 (3)	0.018 (3)	−0.005 (2)	−0.005 (2)	0.002 (2)
C2C	0.030 (3)	0.020 (3)	0.024 (3)	−0.002 (2)	−0.006 (3)	−0.001 (2)
C2D	0.022 (3)	0.033 (3)	0.029 (3)	−0.008 (3)	−0.005 (3)	−0.002 (3)
C3C	0.035 (3)	0.023 (3)	0.028 (3)	−0.014 (3)	−0.001 (3)	−0.002 (2)
C3D	0.029 (3)	0.033 (3)	0.030 (3)	−0.015 (3)	−0.006 (3)	0.003 (3)
C4C	0.030 (3)	0.035 (3)	0.024 (3)	−0.008 (3)	−0.003 (3)	−0.008 (3)
C4D	0.042 (4)	0.017 (3)	0.022 (3)	−0.005 (3)	−0.011 (3)	0.000 (2)
C5C	0.028 (3)	0.036 (4)	0.042 (4)	−0.007 (3)	−0.018 (3)	0.000 (3)
C5D	0.023 (3)	0.034 (3)	0.029 (3)	−0.002 (3)	−0.004 (3)	−0.007 (3)
C6C	0.031 (3)	0.023 (3)	0.035 (4)	−0.008 (3)	−0.010 (3)	0.006 (2)
C6D	0.026 (3)	0.033 (3)	0.028 (3)	−0.009 (3)	−0.003 (3)	−0.003 (3)
C11C	0.024 (3)	0.020 (3)	0.024 (3)	−0.003 (2)	−0.009 (2)	0.003 (2)
C21C	0.022 (3)	0.019 (3)	0.026 (3)	−0.005 (2)	−0.008 (2)	0.000 (2)
C31C	0.029 (3)	0.038 (4)	0.021 (3)	−0.004 (3)	−0.003 (3)	0.002 (3)
C41C	0.059 (5)	0.060 (5)	0.038 (4)	−0.016 (4)	−0.022 (4)	−0.002 (4)
C51C	0.071 (6)	0.049 (5)	0.033 (4)	−0.014 (4)	−0.009 (4)	0.016 (3)

Geometric parameters (Å, º) top

Br4A—C4A	1.903 (6)	C41A—H41A	0.9600
Br4B—C4B	1.909 (9)	C41A—H42A	0.9600
Br4C—C4C	1.907 (8)	C41A—H43A	0.9600
Br4D—C4D	1.892 (6)	C41E—H41E	0.9600
O11A—C11A	1.404 (7)	C41E—H42E	0.9500
O21A—C31E	1.53 (3)	C41E—H43E	0.9600
O21A—C31A	1.499 (15)	C51A—H51A	0.9600
O21A—C21A	1.326 (8)	C51A—H53A	0.9600
O22A—C21A	1.203 (8)	C51A—H52A	0.9600
O11A—H11A	0.9400	C51E—H51E	0.9600
O11C—C11C	1.417 (7)	C51E—H53E	0.9600
O21C—C31C	1.475 (8)	C51E—H52E	0.9600
O21C—C21C	1.324 (7)	C1C—C2C	1.377 (8)
O22C—C21C	1.214 (7)	C1C—C6C	1.407 (9)
O11C—H11C	0.8200	C1C—C11C	1.543 (9)
C1A—C11A	1.526 (8)	C1D—C6D	1.379 (9)
C1A—C6A	1.394 (9)	C1D—C11C	1.539 (8)
C1A—C2A	1.377 (9)	C1D—C2D	1.388 (10)
C1B—C2B	1.387 (10)	C2C—C3C	1.390 (11)
C1B—C11A	1.531 (10)	C2D—C3D	1.385 (9)
C1B—C6B	1.390 (9)	C3C—C4C	1.365 (10)
C2A—C3A	1.393 (10)	C3D—C4D	1.375 (9)
C2B—C3B	1.373 (12)	C4C—C5C	1.376 (10)
C3A—C4A	1.363 (10)	C4D—C5D	1.358 (10)
C3B—C4B	1.371 (11)	C5C—C6C	1.368 (11)
C4A—C5A	1.381 (10)	C5D—C6D	1.386 (9)
C4B—C5B	1.373 (11)	C11C—C21C	1.544 (7)
C5A—C6A	1.379 (10)	C31C—C41C	1.518 (12)
C5B—C6B	1.385 (12)	C31C—C51C	1.520 (10)
C11A—C21A	1.554 (10)	C2C—H2C	0.9300
C31A—C51A	1.51 (3)	C2D—H2D	0.9300
C31A—C41A	1.54 (3)	C3C—H3C	0.9300
C31E—C41E	1.54 (5)	C3D—H3D	0.9300
C31E—C51E	1.42 (5)	C5C—H5C	0.9300
C2A—H2A	0.9300	C5D—H5D	0.9300
C2B—H2B	0.9300	C6C—H6C	0.9300
C3A—H3A	0.9300	C6D—H6D	0.9300
C3B—H3B	0.9300	C31C—H31C	0.9800
C5A—H5A	0.9300	C41C—H41C	0.9600
C5B—H5B	0.9300	C41C—H42C	0.9600
C6A—H6A	0.9300	C41C—H43C	0.9600
C6B—H6B	0.9300	C51C—H51C	0.9600
C31A—H31A	0.9800	C51C—H52C	0.9600
C31E—H31E	0.9800	C51C—H53C	0.9600

C21A—O21A—C31A	115.5 (8)	H52A—C51A—H53A	109.00
C21A—O21A—C31E	122.2 (12)	H51A—C51A—H52A	109.00
C11A—O11A—H11A	110.00	H51A—C51A—H53A	109.00
C21C—O21C—C31C	117.2 (4)	C31A—C51A—H51A	110.00
C11C—O11C—H11C	110.00	C31A—C51A—H53A	110.00
C2A—C1A—C6A	117.9 (6)	C31E—C51E—H53E	110.00
C2A—C1A—C11A	125.7 (5)	C31E—C51E—H51E	110.00
C6A—C1A—C11A	116.3 (5)	H51E—C51E—H53E	110.00
C2B—C1B—C6B	118.5 (7)	H52E—C51E—H53E	109.00
C2B—C1B—C11A	120.5 (6)	H51E—C51E—H52E	109.00
C6B—C1B—C11A	121.0 (6)	C31E—C51E—H52E	109.00
C1A—C2A—C3A	120.9 (6)	C2C—C1C—C6C	118.6 (6)
C1B—C2B—C3B	121.0 (7)	C6C—C1C—C11C	120.6 (5)
C2A—C3A—C4A	119.4 (6)	C2C—C1C—C11C	120.8 (6)
C2B—C3B—C4B	119.5 (8)	C2D—C1D—C11C	120.3 (5)
Br4A—C4A—C3A	120.0 (5)	C6D—C1D—C11C	120.7 (6)
Br4A—C4A—C5A	118.4 (5)	C2D—C1D—C6D	118.9 (6)
C3A—C4A—C5A	121.7 (6)	C1C—C2C—C3C	120.4 (6)
C3B—C4B—C5B	121.3 (8)	C1D—C2D—C3D	120.4 (6)
Br4B—C4B—C3B	118.6 (6)	C2C—C3C—C4C	119.7 (6)
Br4B—C4B—C5B	120.1 (6)	C2D—C3D—C4D	119.5 (7)
C4A—C5A—C6A	118.0 (6)	Br4C—C4C—C5C	119.2 (6)
C4B—C5B—C6B	119.0 (7)	C3C—C4C—C5C	121.1 (7)
C1A—C6A—C5A	122.1 (7)	Br4C—C4C—C3C	119.7 (5)
C1B—C6B—C5B	120.7 (7)	Br4D—C4D—C3D	119.7 (5)
C1A—C11A—C1B	111.1 (5)	C3D—C4D—C5D	120.8 (6)
C1A—C11A—C21A	113.8 (5)	Br4D—C4D—C5D	119.5 (5)
O11A—C11A—C21A	107.9 (5)	C4C—C5C—C6C	119.4 (7)
O11A—C11A—C1A	106.2 (5)	C4D—C5D—C6D	119.9 (6)
O11A—C11A—C1B	112.5 (5)	C1C—C6C—C5C	120.8 (6)
C1B—C11A—C21A	105.4 (5)	C1D—C6D—C5D	120.5 (7)
O21A—C21A—O22A	124.5 (6)	O11C—C11C—C1C	111.5 (5)
O21A—C21A—C11A	113.1 (5)	O11C—C11C—C1D	105.3 (4)
O22A—C21A—C11A	122.3 (6)	C1C—C11C—C1D	111.6 (5)
C41A—C31A—C51A	115.7 (16)	C1C—C11C—C21C	107.1 (5)
O21A—C31A—C41A	108.3 (12)	O11C—C11C—C21C	108.4 (5)
O21A—C31A—C51A	100.3 (12)	C1D—C11C—C21C	112.9 (5)
O21A—C31E—C41E	100 (2)	O21C—C21C—C11C	112.9 (5)
O21A—C31E—C51E	115 (2)	O22C—C21C—C11C	122.0 (5)
C41E—C31E—C51E	113 (3)	O21C—C21C—O22C	125.1 (5)
C3A—C2A—H2A	120.00	O21C—C31C—C51C	105.5 (5)
C1A—C2A—H2A	120.00	C41C—C31C—C51C	112.9 (7)
C3B—C2B—H2B	120.00	O21C—C31C—C41C	108.4 (6)
C1B—C2B—H2B	119.00	C1C—C2C—H2C	120.00
C2A—C3A—H3A	120.00	C3C—C2C—H2C	120.00
C4A—C3A—H3A	120.00	C1D—C2D—H2D	120.00
C4B—C3B—H3B	120.00	C3D—C2D—H2D	120.00
C2B—C3B—H3B	120.00	C2C—C3C—H3C	120.00
C6A—C5A—H5A	121.00	C4C—C3C—H3C	120.00
C4A—C5A—H5A	121.00	C2D—C3D—H3D	120.00
C6B—C5B—H5B	120.00	C4D—C3D—H3D	120.00
C4B—C5B—H5B	121.00	C4C—C5C—H5C	120.00
C1A—C6A—H6A	119.00	C6C—C5C—H5C	120.00
C5A—C6A—H6A	119.00	C4D—C5D—H5D	120.00
C1B—C6B—H6B	120.00	C6D—C5D—H5D	120.00
C5B—C6B—H6B	120.00	C1C—C6C—H6C	120.00
C51A—C31A—H31A	111.00	C5C—C6C—H6C	120.00
O21A—C31A—H31A	111.00	C1D—C6D—H6D	120.00
C41A—C31A—H31A	111.00	C5D—C6D—H6D	120.00
C51E—C31E—H31E	109.00	O21C—C31C—H31C	110.00
C41E—C31E—H31E	110.00	C41C—C31C—H31C	110.00
O21A—C31E—H31E	110.00	C51C—C31C—H31C	110.00
C31A—C41A—H43A	109.00	C31C—C41C—H41C	110.00
H41A—C41A—H42A	109.00	C31C—C41C—H42C	110.00
H41A—C41A—H43A	110.00	C31C—C41C—H43C	109.00
C31A—C41A—H42A	109.00	H41C—C41C—H42C	109.00
H42A—C41A—H43A	109.00	H41C—C41C—H43C	109.00
C31A—C41A—H41A	110.00	H42C—C41C—H43C	109.00
H41E—C41E—H42E	110.00	C31C—C51C—H51C	109.00
C31E—C41E—H42E	110.00	C31C—C51C—H52C	109.00
C31E—C41E—H43E	109.00	C31C—C51C—H53C	110.00
H42E—C41E—H43E	110.00	H51C—C51C—H52C	109.00
C31E—C41E—H41E	109.00	H51C—C51C—H53C	109.00
H41E—C41E—H43E	109.00	H52C—C51C—H53C	109.00
C31A—C51A—H52A	110.00

C31A—O21A—C21A—O22A	5.0 (13)	C1A—C11A—C21A—O22A	−130.0 (7)
C31A—O21A—C21A—C11A	−178.7 (9)	O11A—C11A—C21A—O21A	171.2 (6)
C21A—O21A—C31A—C41A	134.8 (15)	O11A—C11A—C21A—O22A	−12.4 (9)
C21A—O21A—C31A—C51A	−103.6 (12)	C1A—C11A—C21A—O21A	53.6 (8)
C31C—O21C—C21C—O22C	10.2 (9)	C6C—C1C—C2C—C3C	−2.5 (8)
C31C—O21C—C21C—C11C	−167.4 (5)	C11C—C1C—C2C—C3C	175.8 (5)
C21C—O21C—C31C—C41C	78.6 (7)	C2C—C1C—C6C—C5C	4.0 (9)
C21C—O21C—C31C—C51C	−160.4 (6)	C11C—C1C—C6C—C5C	−174.4 (6)
C2A—C1A—C11A—O11A	−112.2 (7)	C2C—C1C—C11C—O11C	−4.6 (7)
C2A—C1A—C11A—C1B	125.2 (7)	C2C—C1C—C11C—C1D	−122.1 (5)
C2A—C1A—C11A—C21A	6.4 (10)	C2C—C1C—C11C—C21C	113.9 (6)
C6A—C1A—C2A—C3A	1.5 (11)	C6C—C1C—C11C—O11C	173.7 (5)
C11A—C1A—C2A—C3A	179.4 (7)	C6C—C1C—C11C—C1D	56.2 (7)
C2A—C1A—C6A—C5A	−1.4 (11)	C6C—C1C—C11C—C21C	−67.9 (7)
C11A—C1A—C6A—C5A	−179.4 (7)	C6D—C1D—C2D—C3D	−1.5 (9)
C6A—C1A—C11A—C21A	−175.7 (6)	C11C—C1D—C2D—C3D	−177.1 (6)
C6A—C1A—C11A—O11A	65.7 (7)	C2D—C1D—C6D—C5D	1.0 (10)
C6A—C1A—C11A—C1B	−56.9 (8)	C11C—C1D—C6D—C5D	176.5 (6)
C2B—C1B—C6B—C5B	0.4 (10)	C2D—C1D—C11C—O11C	81.2 (6)
C2B—C1B—C11A—C1A	−41.2 (8)	C2D—C1D—C11C—C1C	−157.7 (5)
C11A—C1B—C6B—C5B	−178.4 (6)	C2D—C1D—C11C—C21C	−37.0 (8)
C2B—C1B—C11A—O11A	−160.1 (6)	C6D—C1D—C11C—O11C	−94.2 (7)
C11A—C1B—C2B—C3B	179.3 (7)	C6D—C1D—C11C—C1C	26.9 (7)
C6B—C1B—C11A—C21A	−98.7 (6)	C6D—C1D—C11C—C21C	147.6 (6)
C2B—C1B—C11A—C21A	82.5 (7)	C1C—C2C—C3C—C4C	−0.8 (9)
C6B—C1B—C11A—O11A	18.7 (8)	C1D—C2D—C3D—C4D	0.6 (10)
C6B—C1B—C11A—C1A	137.6 (6)	C2C—C3C—C4C—Br4C	−176.6 (5)
C6B—C1B—C2B—C3B	0.5 (11)	C2C—C3C—C4C—C5C	2.8 (10)
C1A—C2A—C3A—C4A	−0.9 (11)	C2D—C3D—C4D—Br4D	−177.7 (5)
C1B—C2B—C3B—C4B	−1.0 (12)	C2D—C3D—C4D—C5D	1.0 (10)
C2A—C3A—C4A—Br4A	179.2 (6)	Br4C—C4C—C5C—C6C	178.0 (5)
C2A—C3A—C4A—C5A	0.1 (12)	C3C—C4C—C5C—C6C	−1.3 (10)
C2B—C3B—C4B—C5B	0.6 (12)	Br4D—C4D—C5D—C6D	177.2 (5)
C2B—C3B—C4B—Br4B	−176.4 (6)	C3D—C4D—C5D—C6D	−1.5 (10)
C3A—C4A—C5A—C6A	0.1 (12)	C4C—C5C—C6C—C1C	−2.1 (10)
Br4A—C4A—C5A—C6A	−179.1 (6)	C4D—C5D—C6D—C1D	0.5 (10)
C3B—C4B—C5B—C6B	0.3 (11)	O11C—C11C—C21C—O21C	−167.6 (5)
Br4B—C4B—C5B—C6B	177.3 (5)	O11C—C11C—C21C—O22C	14.7 (8)
C4A—C5A—C6A—C1A	0.6 (12)	C1C—C11C—C21C—O21C	71.9 (6)
C4B—C5B—C6B—C1B	−0.8 (10)	C1C—C11C—C21C—O22C	−105.7 (7)
C1B—C11A—C21A—O21A	−68.3 (7)	C1D—C11C—C21C—O21C	−51.3 (7)
C1B—C11A—C21A—O22A	108.1 (8)	C1D—C11C—C21C—O22C	131.0 (6)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O11A—H11A···O22A	0.94	2.25	2.660 (6)	105
O11A—H11A···O22Aⁱ	0.94	1.99	2.866 (6)	154
O11C—H11C···O22Cⁱⁱ	0.82	2.17	2.828 (6)	137
C2A—H2A···O21A	0.93	2.44	2.944 (9)	114
C2C—H2C···O11C	0.93	2.41	2.773 (9)	103
C6A—H6A···Br4D	0.93	2.91	3.709 (8)	144
C6B—H6B···O11A	0.93	2.49	2.816 (10)	101
C6C—H6C···O21C	0.93	2.49	2.983 (8)	113

Symmetry codes: (i) −x+2, −y+1, −z+1; (ii) −x+2, −y, −z.

Experimental details

Crystal data
Chemical formula	C₁₇H₁₆Br₂O₃
M_r	428.10
Crystal system, space group	Triclinic, P1
Temperature (K)	200
a, b, c (Å)	10.2036 (6), 10.2166 (6), 17.6687 (13)
α, β, γ (°)	83.775 (5), 73.346 (6), 72.937 (5)
V (Å³)	1686.4 (2)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	4.82
Crystal size (mm)	0.30 × 0.20 × 0.12

Data collection
Diffractometer	Oxford Diffraction Gemini-S CCD-detector diffractometer
Absorption correction	Multi-scan (CrysAlis PRO; Agilent, 2012)
T_min, T_max	0.581, 0.980
No. of measured, independent and observed [I > 2σ(I)] reflections	21160, 6627, 5435
R_int	0.048
(sin θ/λ)_max (Å⁻¹)	0.617

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.055, 0.156, 1.08
No. of reflections	6627
No. of parameters	408
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	1.20, −1.14

Computer programs: CrysAlis PRO (Agilent, 2012), SIR92 (Altomare et al., 1993), SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 1999), PLATON (Spek, 2009).