Evidence for α-lactone intermediates in addition of aqueous bromine to disodium dimethyl-maleate and -fumarate
Robinson, James J.; Buchanan, J. Grant; Kinsman, Richard G.; Mahon, Mary F.; Williams, Ian H.; Charlton, Michael H.; Chemical Communications  (2001) 485–; doi:10.1039/b100335f

data_7114918
_publ_section_title
;
 Evidence for \a-lactone intermediates in addition of aqueous bromine to
 disodium dimethyl-maleate and -fumarate
;
_journal_issue                   5
_journal_name_full               'Chemical Communications'
_journal_page_first              485
_journal_paper_doi               10.1039/b100335f
_journal_year                    2001
_chemical_formula_sum            'C6 H7 Br O4'
_chemical_formula_weight         223.03
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 92.812(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.4057(9)
_cell_length_b                   6.4044(4)
_cell_length_c                   12.0468(11)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    170(2)
_cell_measurement_theta_max      18
_cell_measurement_theta_min      12
_cell_volume                     801.86(11)
_computing_data_reduction        'Denzo and Scalepack (otwinowski & Minor, 1997'
_computing_molecular_graphics    'ORTEX (P.McArdle, 1995)'
_computing_publication_material  'SHELXL-97/2 (Sheldrick,1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      170(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  '4-circle diffractometer'
_diffrn_measurement_method       'scintillation counter'
_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  0.0514
_diffrn_reflns_av_sigmaI/netI    0.0447
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            8001
_diffrn_reflns_theta_full        27.51
_diffrn_reflns_theta_max         27.51
_diffrn_reflns_theta_min         3.74
_exptl_absorpt_coefficient_mu    5.090
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.847
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             440
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.537
_refine_diff_density_min         -0.666
_refine_diff_density_rms         0.097
_refine_ls_extinction_coef       0.0055(18)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.895
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     107
_refine_ls_number_reflns         1842
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.895
_refine_ls_R_factor_all          0.0594
_refine_ls_R_factor_gt           0.0364
_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^)+(0.0837P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1021
_refine_ls_wR_factor_ref         0.1185
_reflns_number_gt                1328
_reflns_number_total             1842
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b100335f.txt
_cod_data_source_block           (Compound_4)k00gb1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_atom_site_symetry_multiplicity' tag replaced with
'_atom_site_symmetry_multiplicity'.

Automatic conversion script
Id: cif_correct_tags 1440 2010-10-19 06:21:57Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               7114918