The stereochemistry of the stable conformational diastereomers in substituted dihydrodibenzo[ef,kl]heptalenes, the doubly bridged biphenyls. Synthesis, structural elucidation and barrier to conformational diastereomerismElectronic supplementary information (ESI) available: Tables I‒III comparing X-ray structural data for 2Aendo‒exo, 1Aendo‒exo and 1Aexo‒exo with AM1 calculations. See http://www.rsc.org/suppdata/p2/b1/b109336n/
Rashidi-Ranjbar, Parviz; Kianmehr, Ebrahim; Wang, Sue-Lein; Liao, Fen-Ling; Journal of the Chemical Society, Perkin Transactions 2  (2002) 545–; doi:10.1039/b109336n

data_7204287
_publ_section_title
;
 The stereochemistry of the stable conformational diastereomers in
 substituted dihydrodibenzo[ef,kl]heptalenes, the doubly bridged
 biphenyls. Synthesis, structural elucidation and barrier to
 conformational diastereomerismElectronic supplementary information
 (ESI) available: Tables I--III comparing X-ray structural data for
 2Aendo--exo, 1Aendo--exo and 1Aexo--exo with AM1 calculations. See
 http://www.rsc.org/suppdata/p2/b1/b109336n/
;
_journal_issue                   3
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 2'
_journal_page_first              545
_journal_paper_doi               10.1039/b109336n
_journal_year                    2002
_chemical_formula_sum            'C20 H16 Cl2 O2'
_chemical_formula_weight         359.23
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 111.53
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.3267(3)
_cell_length_b                   12.84100(10)
_cell_length_c                   11.7222(2)
_cell_measurement_reflns_used    5496
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      2.5
_cell_volume                     1726.01(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.908
_diffrn_measured_fraction_theta_max 0.908
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0550
_diffrn_reflns_av_sigmaI/netI    0.0380
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            10033
_diffrn_reflns_theta_full        28.01
_diffrn_reflns_theta_max         28.01
_diffrn_reflns_theta_min         1.78
_exptl_absorpt_coefficient_mu    0.385
_exptl_absorpt_correction_T_max  0.9202
_exptl_absorpt_correction_T_min  0.6156
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.382
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       Columnar
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.207
_refine_diff_density_min         -0.336
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.071
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         3791
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.071
_refine_ls_R_factor_all          0.0670
_refine_ls_R_factor_gt           0.0496
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0432P)^2^+0.8123P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1188
_refine_ls_wR_factor_ref         0.1325
_reflns_number_gt                2943
_reflns_number_total             3791
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b109336n.txt
_cod_data_source_block           my06m
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        1726.06(5)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7204287