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_2016458
_publ_section_title
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 Two polymorphs of
 4-propyl-3,4-dihydro-2<i>H</i>-naphtho[1,2-<i>b</i>]pyran-5,6-dione
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_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-3,4,5,6-tetrahydro-2H-naphtho[1,2-b]pyran-5,6-dione
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.2833(7)
_cell_length_b                   6.3043(8)
_cell_length_c                   38.753(6)
_cell_measurement_reflns_used    3430
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      24.1
_cell_measurement_theta_min      2.2
_cell_volume                     1290.8(3)
_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 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0831
_diffrn_reflns_av_sigmaI/netI    0.0977
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       45
_diffrn_reflns_limit_l_min       -45
_diffrn_reflns_number            8057
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         24.77
_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    1.319
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             544
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.18
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_refine_ls_number_reflns         1399
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_refine_ls_R_factor_gt           0.0462
_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^)+(0.0560P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0963
_refine_ls_wR_factor_ref         0.1077
_reflns_number_gt                738
_reflns_number_total             1399
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3197.cif
_cod_data_source_block           Io
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 'Orthorhombic' changed to
'orthorhombic' 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 
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_cod_database_code               2016458
_cod_database_fobs_code          2016458