(±)-<i>cis</i>-2-Methyl-4-oxocyclohexanecarboxylic acid: catemeric hydrogen bonding in a δ-keto acid derived from Hagemann's ester
Lalancette, Roger A.; Thompson, Hugh W.; Acta Crystallographica Section C 59 (2003) o679–o681; doi:10.1107/S0108270103024545

data_2013595
_publ_section_title
;
 (+-)-<i>cis</i>-2-Methyl-4-oxocyclohexanecarboxylic acid: catemeric
 hydrogen bonding in a \d-keto acid derived from Hagemann's ester
;
_journal_issue                   12
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o679
_journal_page_last               o681
_journal_paper_doi               10.1107/S0108270103024545
_journal_volume                  59
_journal_year                    2003
_chemical_formula_iupac          'C8 H12 O3'
_chemical_formula_moiety         'C8 H12 O3'
_chemical_formula_sum            'C8 H12 O3'
_chemical_formula_weight         156.18
_chemical_melting_point          333
_chemical_name_systematic
;
(+-)-cis-2-Methyl-4-oxocyclohexanecarboxylic acid
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 97.46(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.7540(10)
_cell_length_b                   5.7250(10)
_cell_length_c                   21.078(4)
_cell_measurement_reflns_used    37
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      11.4
_cell_measurement_theta_min      3.3
_cell_volume                     808.1(2)
_computing_cell_refinement       XSCANS
_computing_data_collection       'XSCANS (Siemens, 1996)'
_computing_data_reduction        XSCANS
_computing_molecular_graphics    'SHELXP97 in SHELXTL'
_computing_publication_material  'SHELXL97 in SHELXTL'
_computing_structure_refinement  'SHELXL97 in SHELXTL'
_computing_structure_solution    'SHELXS97 in SHELXTL (Sheldrick, 1997)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       2\q/\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  0.051
_diffrn_reflns_av_sigmaI/netI    0.062
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            2174
_diffrn_reflns_theta_full        25.01
_diffrn_reflns_theta_max         25.01
_diffrn_reflns_theta_min         1.95
_diffrn_standards_decay_%        'variation <1.5'
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_T_max  0.996
_exptl_absorpt_correction_T_min  0.976
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   '(SHELXTL; Sheldrick, 1997)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.284
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelepiped
_exptl_crystal_F_000             336
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.24
_refine_diff_density_min         -0.17
_refine_ls_goodness_of_fit_ref   1.05
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     104
_refine_ls_number_reflns         1415
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.05
_refine_ls_R_factor_all          0.105
_refine_ls_R_factor_gt           0.064
_refine_ls_shift/su_max          0.00
_refine_ls_shift/su_mean         0.00
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0760P)^2^+0.2612P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.148
_refine_ls_wR_factor_ref         0.172
_reflns_number_gt                910
_reflns_number_total             1415
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fr1436.cif
_cod_data_source_block           I
_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 

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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2013595
_cod_database_fobs_code          2013595