2-Methyl-4-phenyl-2-(trimethylsilyloxy)-3,4-dihydro-2<i>H</i>,5<i>H</i>-pyrano[3,2-<i>c</i>][1]benzopyran-5-one
Da-Quan Peng; Acta Crystallographica Section E 62 (2006) o3264–o3265; doi:10.1107/S160053680602575X

data_2209728
_publ_section_title
2-Methyl-4-phenyl-2-(trimethylsilyloxy)-3,4-dihydro-2<i>H</i>,5<i>H</i>-pyrano[3,2-<i>c</i>][1]benzopyran-5-one
_journal_coeditor_code           AT2052
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o3264
_journal_page_last               o3265
_journal_paper_doi               10.1107/S160053680602575X
_journal_volume                  62
_journal_year                    2006
_chemical_formula_iupac          'C22 H24 O4 Si'
_chemical_formula_moiety         'C22 H24 O4 Si'
_chemical_formula_sum            'C22 H24 O4 Si'
_chemical_formula_weight         380.50
_chemical_melting_point          418.2
_chemical_name_systematic
;
2-methyl-4-phenyl-2-(trimethylsilyloxy)-3,4-dihydro-2H,5H-pyrano
[3,2-c][1]benzopyran-5-one
;
_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
_cell_angle_alpha                90
_cell_angle_beta                 100.74(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.038(2)
_cell_length_b                   12.396(3)
_cell_length_c                   16.853(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      13
_cell_measurement_theta_min      10
_cell_volume                     2060.3(8)
_computing_cell_refinement       'CAD-4 Software'
_computing_data_collection       'CAD-4 Software (Enraf--Nonius, 1989)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    SHELXTL
_computing_publication_material  'SHELXTL and PLATON (Spek, 2003)'
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\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  0.1167
_diffrn_reflns_av_sigmaI/netI    0.0670
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            4268
_diffrn_reflns_theta_full        25.97
_diffrn_reflns_theta_max         25.97
_diffrn_reflns_theta_min         2.05
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 200
_diffrn_standards_interval_time  120
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.137
_exptl_absorpt_correction_T_max  0.962
_exptl_absorpt_correction_T_min  0.931
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(XCAD4; Harms & Wocadlo, 1995)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.227
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             808
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.19
_refine_diff_density_min         -0.27
_refine_ls_extinction_coef       0.0157(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.002
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     245
_refine_ls_number_reflns         4029
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.002
_refine_ls_R_factor_all          0.1130
_refine_ls_R_factor_gt           0.0543
_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^)+(0.05P)^2^+1P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1281
_refine_ls_wR_factor_ref         0.1514
_reflns_number_gt                2297
_reflns_number_total             4029
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            at2052.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2209728
_cod_database_fobs_code          2209728