#------------------------------------------------------------------------------
#$Date: 2009-04-21 15:31:11 +0100 (Tue, 21 Apr 2009) $
#$Revision: 665 $
#$URL: svn://www.crystallography.net/cod/cif/2/2000820.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_2000820
loop_
_publ_author_name
'Robinson, P. D.'
'Meyers, C. Y.'
'Kolb, V. M.'
'Tunnell, J. L.'
'Ferrara, J. D.'
_publ_section_title
;
 Structure of the crystalline dimer of \a-hydroxyisobutyrophenone:
 (<i>R</i>,<i>S</i>)-3,3,6,6-tetramethyl-1,4-diphenyl-2,5,7-trioxabicyclo[2.2.1]heptane
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1033
_journal_page_last               1036
_journal_volume                  48
_journal_year                    1992
_chemical_formula_sum            'C20 H22 O3'
_chemical_formula_weight         310.39
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 91.2(2)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   16.58(3)
_cell_length_b                   8.340(10)
_cell_length_c                   24.35(3)
_cell_volume                     3367(8)
_diffrn_radiation_type           Mo
_diffrn_radiation_wavelength     0.71069
_exptl_absorpt_coefficient_mu    0.076
_exptl_crystal_density_diffrn    1.224
_exptl_crystal_F_000             1328
_[local]_cod_data_source_file    cr0353.cif
_[local]_cod_data_source_block   cr0353a
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
C(1) .3320(6) .2120(10) .1157(5)
O(2) .2931(4) .0992(8) .0801(3)
C(3) .3436(7) -.0440(10) .0826(4)
C(4) .4168(6) .0210(10) .1154(4)
O(5) .4564(4) .1428(9) .0828(3)
C(6) .4043(7) .2820(10) .0855(4)
O(7) .3751(4) .1158(8) .1559(3)
C(8) .4490(10) .416(2) .1148(6)
C(9) .3845(9) .337(2) .0270(7)
C(10) .3014(7) -.173(2) .1107(5)
C(11) .3660(10) -.096(2) .0240(7)
C(12) .2718(7) .326(2) .1425(6)
C(13) .2739(7) .358(2) .1957(5)
C(14) .2188(9) .457(2) .2173(5)
C(15) .1618(8) .531(2) .1838(7)
C(16) .1572(7) .4940(10) .1300(6)
C(17) .2141(7) .396(2) .1071(5)
C(18) .4794(7) -.091(2) .1408(6)
C(19) .4701(7) -.141(2) .1949(5)
C(20) .5254(8) -.253(2) .2167(5)
C(21) .5886(8) -.307(2) .1846(6)
C(22) .5949(7) -.251(2) .1313(6)
C(23) .5402(7) -.1410(10) .1091(5)
C(1') .1657(7) .0440(10) .3887(5)
O(2') .2009(4) .1570(10) .4269(3)
C(3') .1490(6) .2980(10) .4243(5)
C(4') .0792(7) .2260(10) .3874(5)
O(5') .0407(4) .1108(9) .4175(3)
C(6') .0922(6) -.0340(10) .4167(5)
O(7') .1269(4) .1412(8) .3488(3)
C(8') .0506(6) -.158(2) .3775(6)
C(9') .1096(8) -.098(2) .4736(5)
C(10') .1972(8) .430(2) .3933(6)
C(11') .1265(8) .349(2) .4795(4)
C(12') .2277(6) -.0630(10) .3666(4)
C(13') .2274(7) -.1000(10) .3104(5)
C(14') .2852(8) -.206(2) .2893(5)
C(15') .3436(7) -.271(2) .3241(6)
C(16') .3415(8) -.237(2) .3797(6)
C(17') .2866(6) -.1300(10) .3996(4)
C(18') .0230(7) .340(2) .3615(4)
C(19') .0297(7) .3950(10) .3092(5)
C(20') -.0247(9) .502(2) .2854(5)
C(21') -.0878(8) .556(2) .3152(6)
C(22') -.0989(8) .505(2) .3671(7)
C(23') -.0438(8) .400(2) .3900(5)
H(8A) .4923 .4510 .0932
H(8B) .4687 .3791 .1493
H(8C) .4127 .5034 .1203
H(9A) .3634 .2501 .0062
H(9B) .4321 .3759 .0105
H(9C) .3456 .4211 .0280
H(10A) .2527 -.1976 .0911
H(10B) .3347 -.2657 .1123
H(10C) .2892 -.1398 .1469
H(11A) .3182 -.1240 .0039
H(11B) .4010 -.1858 .0259
H(11C) .3920 -.0097 .0062
H(13) .3144 .3112 .2187
H(14) .2191 .4755 .2558
H(15) .1261 .6083 .1987
H(16) .1143 .5356 .1078
H(17) .2144 .3772 .0687
H(19) .4275 -.1006 .2164
H(20) .5198 -.2912 .2531
H(21) .6268 -.3809 .1991
H(22) .6376 -.2882 .1093
H(23) .5455 -.1020 .0727
H(8A') .0111 -.2165 .3970
H(8B') .0899 -.2306 .3641
H(8C') .0255 -.1038 .3475
H(9A') .0604 -.1280 .4902
H(9B') .1439 -.1887 .4715
H(9C') .1353 -.0171 .4952
H(10A') .1658 .5253 .3910
H(10B') .2089 .3936 .3574
H(10C') .2462 .4519 .4129
H(11A') .1034 .2619 .4985
H(11B') .0884 .4343 .4766
H(11C') .1732 .3858 .4991
H(13') .1881 -.0539 .2864
H(14') .2840 -.2332 .2514
H(15') .3847 -.3377 .3099
H(16') .3784 -.2887 .4043
H(17') .2895 -.1021 .4374
H(19') .0736 .3587 .2880
H(20') -.0181 .5368 .2487
H(21') -.1247 .6302 .2992
H(22') -.1438 .5410 .3873
H(23') -.0512 .3655 .4268
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
C(1) O(2) 1.430(10)
C(1) C(6) 1.530(10)
C(1) O(7) 1.450(10)
C(1) C(12) 1.53(2)
O(2) C(3) 1.460(10)
C(3) C(4) 1.540(10)
C(3) C(10) 1.46(2)
C(3) C(11) 1.54(2)
C(4) O(5) 1.450(10)
C(4) O(7) 1.450(10)
C(4) C(18) 1.52(2)
O(5) C(6) 1.450(10)
C(6) C(8) 1.510(10)
C(6) C(9) 1.53(2)
C(1') O(2') 1.440(10)
C(1') C(6') 1.550(10)
C(1') O(7') 1.410(10)
C(1') C(12') 1.470(10)
O(2') C(3') 1.450(10)
C(3') C(4') 1.570(10)
C(3') C(10') 1.57(2)
C(3') C(11') 1.470(10)
C(4') O(5') 1.370(10)
C(4') O(7') 1.430(10)
C(4') C(18') 1.47(2)
O(5') C(6') 1.480(10)
C(6') C(8') 1.56(2)
C(6') C(9') 1.51(2)
C(12) C(13) 1.320(10)
C(12) C(17) 1.40(2)
C(13) C(14) 1.34(2)
C(14) C(15) 1.38(2)
C(15) C(16) 1.35(2)
C(16) C(17) 1.37(2)
C(18) C(19) 1.39(2)
C(18) C(23) 1.35(2)
C(19) C(20) 1.40(2)
C(20) C(21) 1.39(2)
C(21) C(22) 1.39(2)
C(22) C(23) 1.39(2)
C(12') C(13') 1.400(10)
C(12') C(17') 1.370(10)
C(13') C(14') 1.41(2)
C(14') C(15') 1.38(2)
C(15') C(16') 1.39(2)
C(16') C(17') 1.37(2)
C(18') C(19') 1.360(10)
C(18') C(23') 1.41(2)
C(19') C(20') 1.38(2)
C(20') C(21') 1.36(2)
C(21') C(22') 1.35(2)
C(22') C(23') 1.38(2)