Ethyl 2,3,5,6-tetramethylbenzoate
Pinkus, A. G.; Klausmeyer, Kevin K.; Feazell, Rodney P.; Lin, Ellen C. H. Y.; Acta Crystallographica Section E 61 (2005) o662–o663; doi:10.1107/S1600536805004319

data_2205199
_publ_section_title
;
 Ethyl 2,3,5,6-tetramethylbenzoate
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o662
_journal_page_last               o663
_journal_paper_doi               10.1107/S1600536805004319
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C13 H18 O2'
_chemical_formula_moiety         'C13 H18 O2'
_chemical_formula_sum            'C13 H18 O2'
_chemical_formula_weight         206.27
_chemical_name_systematic
;
Ethyl 2,3,5,6-tetramethylbenzoate
;
_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                 101.725(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.2230(10)
_cell_length_b                   5.5837(4)
_cell_length_c                   11.5842(7)
_cell_measurement_reflns_used    2643
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      27.68
_cell_measurement_theta_min      2.28
_cell_volume                     1154.12(13)
_computing_cell_refinement       'APEX2 (Bruker, 2003)'
_computing_data_collection       'APEX2 (Bruker, 2003)'
_computing_data_reduction        'SAINT-Plus (Bruker, 2003)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2000)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      110(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX2 CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_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  0.0349
_diffrn_reflns_av_sigmaI/netI    0.0295
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            10368
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         2.28
_diffrn_standards_decay_%        <1
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.98
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.187
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             448
_exptl_crystal_size_max          .194
_exptl_crystal_size_mid          .102
_exptl_crystal_size_min          .083
_refine_diff_density_max         0.246
_refine_diff_density_min         -0.188
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     141
_refine_ls_number_reflns         2342
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0567
_refine_ls_R_factor_gt           0.0387
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0492P)^2^+0.3725P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0961
_refine_ls_wR_factor_ref         0.1076
_reflns_number_gt                1777
_reflns_number_total             2342
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ac6159.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2205199
_cod_database_fobs_code          2205199