(4,6-Dibromo-<i>m</i>-phenylenedimethylidyne) tetraacetate
Guang-Liang Song; Shan Liu; Shui-Ping Deng; Yuan-Yuan Liu; Hong-Jun Zhu; Acta Crystallographica Section E 64 (2008) o153–o153; doi:10.1107/S1600536807063581

data_2217177
_publ_section_title
;
 (4,6-Dibromo-<i>m</i>-phenylenedimethylidyne) tetraacetate
;
_journal_coeditor_code           LH2578
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o153
_journal_page_last               o153
_journal_paper_doi               10.1107/S1600536807063581
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C16 H16 Br2 O8'
_chemical_formula_moiety         'C16 H16 Br2 O8'
_chemical_formula_sum            'C16 H16 Br2 O8'
_chemical_formula_weight         496.09
_chemical_name_common
;
\a,\a'-bis(acetyloxy)-4,6-dibromo-1,3-Benzenedimethanol diacetate
;
_chemical_name_systematic
;
(4,6-Dibromo-m-phenylenedimethylidyne) tetraacetate
;
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   20.639(4)
_cell_length_b                   10.150(2)
_cell_length_c                   9.0880(18)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      14
_cell_measurement_theta_min      10
_cell_volume                     1903.8(6)
_computing_cell_refinement       'CAD-4 Software (Enraf--Nonius, 1985)'
_computing_data_collection       'CAD-4 Software (Enraf--Nonius, 1985)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'SHELXTL (Bruker, 2000)'
_computing_publication_material  'SHELXTL (Bruker, 2000)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\q
_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  0.0540
_diffrn_reflns_av_sigmaI/netI    0.0631
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3687
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         1.97
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 200
_diffrn_standards_interval_time  2h
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    4.297
_exptl_absorpt_correction_T_max  0.4803
_exptl_absorpt_correction_T_min  0.2783
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(North <i>et al.</i>,  1968)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.731
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             984
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.584
_refine_diff_density_min         -0.492
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.955
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     107
_refine_ls_number_reflns         1877
_refine_ls_number_restraints     29
_refine_ls_restrained_S_all      0.957
_refine_ls_R_factor_all          0.1696
_refine_ls_R_factor_gt           0.0672
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.02P)^2^+0.00P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1002
_refine_ls_wR_factor_ref         0.1301
_reflns_number_gt                805
_reflns_number_total             1877
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            lh2578.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_database_code               2217177
_cod_database_fobs_code          2217177