2,2',4,4',6,6'-Hexamethyl-4,4'-bi[4<i>H</i>-pyranyl]
Ziemer, Burkhard; Grubert, Lutz; Acta Crystallographica Section C 56 (2000) e304–e304; doi:10.1107/S0108270100007885

data_2011167
_publ_section_title
;
 2,2',4,4',6,6'-Hexamethyl-4,4'-bi[4<i>H</i>-pyranyl]
;
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              e304
_journal_page_last               e304
_journal_paper_doi               10.1107/S0108270100007885
_journal_volume                  56
_journal_year                    2000
_chemical_formula_sum            'C16 H22 O2'
_chemical_formula_weight         246.34
_chemical_melting_point          385.0(10)
_chemical_name_systematic
;
 2,4,6,2',4',6'-Hexamethyl-4H,4'H[4,4']bipyranyl
;
_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'
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 114.26(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.842(2)
_cell_length_b                   11.458(3)
_cell_length_c                   8.824(2)
_cell_measurement_reflns_used    5000
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      24.0
_cell_measurement_theta_min      2.0
_cell_volume                     722.9(4)
_computing_cell_refinement       IPDS-2.87
_computing_data_collection       'IPDS-2.87 (Stoe & Cie, 1997)'
_computing_data_reduction        IPDS-2.87
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      180(2)
_diffrn_detector_area_resol_mean 6.667
_diffrn_measured_fraction_theta_full .977
_diffrn_measured_fraction_theta_max .977
_diffrn_measurement_device       'Stoe IPDS'
_diffrn_measurement_method       '\f-rotation, \f-incr. = 1.5\%, 160 exposures'
_diffrn_radiation_monochromator  'planar graphite'
_diffrn_radiation_source         'fine-focus sealed X-ray tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     .71073
_diffrn_reflns_av_R_equivalents  .0325
_diffrn_reflns_av_sigmaI/netI    .0238
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            5901
_diffrn_reflns_theta_full        28.07
_diffrn_reflns_theta_max         28.07
_diffrn_reflns_theta_min         3.36
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    .073
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.132
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    none
_exptl_crystal_description       plate
_exptl_crystal_F_000             268
_exptl_crystal_size_max          .52
_exptl_crystal_size_mid          .40
_exptl_crystal_size_min          .22
_refine_diff_density_max         .222
_refine_diff_density_min         -.159
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     121
_refine_ls_number_reflns         1716
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          .054
_refine_ls_R_factor_gt           .044
_refine_ls_shift/su_max          .003
_refine_ls_shift/su_mean         .001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0650P)^2^+0.1273P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         .119
_reflns_number_gt                1393
_reflns_number_total             1716
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            qa0317.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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        722.9(3)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2011167
_cod_database_fobs_code          2011167