Pseudoacids. I. 4- and 5-Oxoacids
Valente, E. J.; Fuller, J. F.; Ball, J. D.; Acta Crystallographica Section B 54 (1998) 162–173; doi:10.1107/S010876819701149X

data_2105568
_publ_section_title
;
 Pseudoacids. I. 4- and 5-Oxoacids
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_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              162
_journal_page_last               173
_journal_paper_doi               10.1107/S010876819701149X
_journal_volume                  54
_journal_year                    1998
_chemical_formula_sum            'C4 H2 Cl2 O3'
_chemical_formula_weight         168.96
_chemical_name_common            'mucochloric acid'
_chemical_name_systematic
;
 3,4-dichloro-5-hydroxy-2,5-dihydrofuran-2-one
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_audit_creation_method           SHELXL
_cell_angle_alpha                99.50(5)
_cell_angle_beta                 102.38(6)
_cell_angle_gamma                90.29(6)
_cell_formula_units_Z            4
_cell_length_a                   6.277(5)
_cell_length_b                   8.085(5)
_cell_length_c                   12.369(9)
_cell_measurement_reflns_used    40
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      22.5
_cell_measurement_theta_min      12.5
_cell_volume                     604.2(8)
_computing_cell_refinement       'P3/PC (Siemens, 1989a)'
_computing_data_collection       'P3/PC (Siemens, 1989a)'
_computing_data_reduction        'XDISK (Siemens, 1989b)'
_computing_molecular_graphics    'XP (Siemens, 1989)'
_computing_publication_material  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1985)'
_diffrn_ambient_temperature      294(2)
_diffrn_measurement_device       'scintillation counter, PH analysis'
_diffrn_measurement_method       '\w scans, 3.0 degrees'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0265
_diffrn_reflns_av_sigmaI/netI    0.0450
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            3903
_diffrn_reflns_theta_max         30.09
_diffrn_reflns_theta_min         2.56
_diffrn_standards_decay_%        -3.2(14)
_diffrn_standards_interval_count 97
_diffrn_standards_interval_time  90
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.994
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.857
_exptl_crystal_description       'thin plate'
_exptl_crystal_F_000             336
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.05
_refine_diff_density_max         1.996
_refine_diff_density_min         -0.736
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   0.998
_refine_ls_goodness_of_fit_obs   1.225
_refine_ls_hydrogen_treatment    'H atoms fixed, calculated'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     165
_refine_ls_number_reflns         3519
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.011
_refine_ls_restrained_S_obs      1.225
_refine_ls_R_factor_all          0.1515
_refine_ls_R_factor_obs          0.1174
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.2416P)^2^+0.0000P], where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.3437
_refine_ls_wR_factor_obs         0.3132
_reflns_number_observed          1999
_reflns_number_total             3526
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            fr0001.cif
_cod_data_source_block           8
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'w =
1/[\s^2^(Fo^2^)+(0.2416P)^2^+0.0000P], where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to 'w =
1/[\s^2^(Fo^2^)+(0.2416P)^2^+0.0000P], where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
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_cod_database_code               2105568