Two polymorphs of 4-propyl-3,4-dihydro-2<i>H</i>-naphtho[1,2-<i>b</i>]pyran-5,6-dione
Sugiono, Erli; Bolte, Michael; Acta Crystallographica Section C 64 (2008) o84–o86; doi:10.1107/S0108270108001170

data_2016457
_publ_section_title
;
 Two polymorphs of
 4-propyl-3,4-dihydro-2<i>H</i>-naphtho[1,2-<i>b</i>]pyran-5,6-dione
;
_journal_coeditor_code           SK3197
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o84
_journal_page_last               o86
_journal_paper_doi               10.1107/S0108270108001170
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C16 H16 O3'
_chemical_formula_moiety         'C16 H16 O3'
_chemical_formula_sum            'C16 H16 O3'
_chemical_formula_weight         256.29
_chemical_name_systematic
;
4-propyl-3,4-dihydro-2H-naphtho[1,2-b]pyran-5,6-dione
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 95.084(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.3201(7)
_cell_length_b                   5.2972(8)
_cell_length_c                   19.429(2)
_cell_measurement_reflns_used    3913
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.5
_cell_measurement_theta_min      2.2
_cell_volume                     647.90(14)
_computing_cell_refinement       'X-Area (Stoe & Cie, 2001)'
_computing_data_collection       'X-Area (Stoe & Cie, 2001)'
_computing_data_reduction        'X-Area (Stoe & Cie, 2001)'
_computing_molecular_graphics    'XP in SHELXTL-Plus (Sheldrick, 1991)'
_computing_publication_material
'SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Stoe IPDSII two-circle diffractometer'
_diffrn_measurement_method       \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  0.0994
_diffrn_reflns_av_sigmaI/netI    0.0639
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            6418
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.45
_diffrn_reflns_theta_min         2.10
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.314
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             272
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.155
_refine_diff_density_min         -0.181
_refine_ls_extinction_coef       0.088(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
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_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
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_refine_ls_number_reflns         1331
_refine_ls_number_restraints     1
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_refine_ls_R_factor_gt           0.0405
_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^)+(0.0396P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0818
_refine_ls_wR_factor_ref         0.0871
_reflns_number_gt                1021
_reflns_number_total             1331
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3197.cif
_cod_data_source_block           Im
_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 
;
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2016457
_cod_database_fobs_code          2016457