5,6-Dimethyl-1,2,9,10-tetrahydropyrano[3,2-<i>f</i>]chromene-3,8-dione
Goswami, Shailesh K.; Hanton, Lyall R.; McAdam, C. John; Moratti, Stephen C.; Simpson, Jim; Acta Crystallographica Section E 68 (2012) o2216–; doi:10.1107/S1600536812027699

data_2235370
_publ_section_title
;
 5,6-Dimethyl-1,2,9,10-tetrahydropyrano[3,2-<i>f</i>]chromene-3,8-dione
;
_journal_coeditor_code           BT5941
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2216
_journal_paper_doi               10.1107/S1600536812027699
_journal_volume                  68
_journal_year                    2012
_chemical_formula_iupac          'C14 H14 O4'
_chemical_formula_moiety         'C14 H14 O4'
_chemical_formula_sum            'C14 H14 O4'
_chemical_formula_weight         246.25
_chemical_name_systematic
;
5,6-dimethyl-1,2,9,10-tetrahydropyrano[3,2-<i>f</i>]chromene-3,8-dione
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 96.1134(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.0726(2)
_cell_length_b                   8.79820(10)
_cell_length_c                   8.05550(10)
_cell_measurement_reflns_used    3955
_cell_measurement_temperature    92(2)
_cell_measurement_theta_max      38.29
_cell_measurement_theta_min      2.64
_cell_volume                     1132.65(2)
_computing_cell_refinement       'APEX2 (Bruker, 2011) and SAINT (Bruker, 2011)'
_computing_data_collection       'APEX2 (Bruker, 2011)'
_computing_data_reduction        'SAINT (Bruker, 2011)'
_computing_molecular_graphics
;
SHELXTL (Sheldrick, 2008) and <i>Mercury</i> (Macrae <i>et al.</i>,
2008)
;
_computing_publication_material
;
SHELXL97 (Sheldrick, 2008), enCIFer (Allen <i>et al.</i>, 2004),
PLATON (Spek,
2009) and publCIF (Westrip 2010)
;
_computing_structure_refinement
;
SHELXL97 (Sheldrick, 2008) and <i>TITAN2000</i> (Hunter & Simpson,
1999)
;
_computing_structure_solution
;
SHELXS97 (Sheldrick, 2008) and <i>TITAN2000</i> (Hunter & Simpson,
1999)
;
_diffrn_ambient_temperature      92(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.885
_diffrn_measurement_device_type  'Bruker APEXII CCD area-detector'
_diffrn_measurement_method       '\f & \w scans'
_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  0.0382
_diffrn_reflns_av_sigmaI/netI    0.0389
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            9744
_diffrn_reflns_theta_full        35.50
_diffrn_reflns_theta_max         39.30
_diffrn_reflns_theta_min         3.57
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.106
_exptl_absorpt_correction_T_max  0.7477
_exptl_absorpt_correction_T_min  0.5697
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2011)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.444
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'rectangular block'
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.53
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.465
_refine_diff_density_min         -0.381
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.079
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     83
_refine_ls_number_reflns         2989
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.079
_refine_ls_R_factor_all          0.0631
_refine_ls_R_factor_gt           0.0503
_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^)+(0.0702P)^2^+0.4368P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1403
_refine_ls_wR_factor_ref         0.1478
_reflns_number_gt                2358
_reflns_number_total             2989
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bt5941.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2235370
_cod_database_fobs_code          2235370