Naturally occurring 1,2,8-trimethoxyxanthone and biphenyl ether intermediates leading to 1,2-dimethoxyxanthone
Gales, Luis; Sousa, Maria Emilia de; Pinto, Madalena M. M.; Kijjoa, Anake; Damas, Ana M.; Acta Crystallographica Section C 57 (2001) 1319–1323; doi:10.1107/S010827010101349X

data_2012294
_publ_section_title
;
 Naturally occurring 1,2,8-trimethoxyxanthone and biphenyl ether
 intermediates leading to 1,2-dimethoxyxanthone
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1319
_journal_page_last               1323
_journal_paper_doi               10.1107/S010827010101349X
_journal_volume                  57
_journal_year                    2001
_chemical_formula_moiety         'C15 H12 O4'
_chemical_formula_sum            'C15 H12 O4'
_chemical_formula_weight         256.25
_chemical_melting_point          .406E-305
_chemical_name_systematic
;
1,2-Dimethoxy-9H-xanthen-9-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'
_audit_creation_method           SHELXL97
_cell_angle_alpha                90
_cell_angle_beta                 97.23(6)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   4.953(2)
_cell_length_b                   13.930(6)
_cell_length_c                   17.670(8)
_cell_measurement_reflns_used    1542
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      24.11
_cell_measurement_theta_min      3.74
_cell_volume                     1209.5(9)
_computing_cell_refinement       IPDS
_computing_data_collection       'IPDS (Stoe & Cie, 1994)'
_computing_data_reduction        IPDS
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 1997)'
_computing_publication_material  'SHELXL97 and ORTEP-3'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full .938
_diffrn_measured_fraction_theta_max .938
_diffrn_measurement_device_type  'Stoe IPDS'
_diffrn_measurement_method       'Image Plate'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     .71069
_diffrn_reflns_av_R_equivalents  .056
_diffrn_reflns_av_sigmaI/netI    .035
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            7542
_diffrn_reflns_theta_full        24.12
_diffrn_reflns_theta_max         24.12
_diffrn_reflns_theta_min         3.74
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    .103
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.407
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'rectangular prism'
_exptl_crystal_F_000             536
_exptl_crystal_size_max          .60
_exptl_crystal_size_mid          .25
_exptl_crystal_size_min          .20
_refine_diff_density_max         .17
_refine_diff_density_min         -.16
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     180
_refine_ls_number_reflns         1807
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          .080
_refine_ls_R_factor_gt           .052
_refine_ls_shift/su_max          .001
_refine_ls_shift/su_mean         .000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.08P)^2^+0.422P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         .168
_reflns_number_gt                1225
_reflns_number_total             1807
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bm1457.cif
_cod_data_source_block           III
_cod_depositor_comments
;
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_sg_symbol_H-M      'P 21/n'
_cod_database_code               2012294
_cod_database_fobs_code          2012294