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_2105567
_publ_section_title
;
 Pseudoacids. I. 4- and 5-Oxoacids
;
_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            'C8 H10 O4'
_chemical_formula_weight         170.16
_chemical_name_common            'penicillic acid'
_chemical_name_systematic
;
 4-methoxy-5-hydroxy-5-(2'allyl)-2,5-dihydrofuran-2-one
;
_space_group_IT_number           86
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-P 4bc'
_symmetry_space_group_name_H-M   'P 42/n :2'
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   15.83(2)
_cell_length_b                   15.83(2)
_cell_length_c                   7.016(11)
_cell_measurement_reflns_used    30
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      20
_cell_measurement_theta_min      12.5
_cell_volume                     1758(4)
_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      568(2)
_diffrn_measurement_device       'scintillation counter, PH analysis'
_diffrn_measurement_method       \w
_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  0.0751
_diffrn_reflns_av_sigmaI/netI    0.2973
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            7107
_diffrn_reflns_theta_max         27.5
_diffrn_reflns_theta_min         1.82
_diffrn_standards_decay_%        -2.5(5)
_diffrn_standards_interval_count 97
_diffrn_standards_interval_time  90
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.285
_exptl_crystal_description       prism
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.184
_refine_diff_density_min         -0.168
_refine_ls_extinction_coef       0.0155(17)
_refine_ls_extinction_method     'SHELXL93 (Sheldrick, 1993)'
_refine_ls_goodness_of_fit_all   0.838
_refine_ls_goodness_of_fit_obs   1.481
_refine_ls_hydrogen_treatment    'H atoms fixed, calculated'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     111
_refine_ls_number_reflns         2046
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.897
_refine_ls_restrained_S_obs      1.481
_refine_ls_R_factor_all          0.1411
_refine_ls_R_factor_obs          0.0557
_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^)+(0.0364P)^2^+0.0000P], where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1406
_refine_ls_wR_factor_obs         0.1144
_reflns_number_observed          577
_reflns_number_total             2051
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            fr0001.cif
_cod_data_source_block           7
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'w =
1/[\s^2^(Fo^2^)+(0.0364P)^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^)+(0.0364P)^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 
;
_cod_original_cell_volume        1759.(5)
_cod_original_sg_symbol_H-M      'P 42/n'
_cod_database_code               2105567