Three sterically hindered 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4<i>H</i>-pyran-3-carboxylate derivatives
Vladimir N. Nesterov; David J. Wiedenfeld; Svitlana V. Nesterova; Lucas F. Hastings; Acta Crystallographica Section C 63 (2007) o685–o689; doi:10.1107/S0108270107049001

data_2016307
_publ_section_title
;
 Three sterically hindered
 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4<i>H</i>-pyran-3-carboxylate
 derivatives
;
_journal_coeditor_code           BM3039
_journal_issue                   12
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o685
_journal_page_last               o689
_journal_paper_doi               10.1107/S0108270107049001
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C20 H18 N2 O3'
_chemical_formula_moiety         'C20 H18 N2 O3'
_chemical_formula_sum            'C20 H18 N2 O3'
_chemical_formula_weight         334.36
_chemical_name_systematic
;
ethyl 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4<i>H</i>-pyran-3-carboxylate
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXTL-2001
_cell_angle_alpha                90.00
_cell_angle_beta                 99.963(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8638(7)
_cell_length_b                   19.4628(18)
_cell_length_c                   11.0823(10)
_cell_measurement_reflns_used    1424
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26
_cell_measurement_theta_min      3
_cell_volume                     1670.6(3)
_computing_cell_refinement       'SAINT-Plus (Bruker, 2001)'
_computing_data_collection       'APEX2 (Bruker, 2005)'
_computing_data_reduction        'SAINT-Plus (Bruker, 2001)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2001)'
_computing_publication_material  'SHELXTL (Sheldrick, 2001)'
_computing_structure_refinement  'SHELXTL (Sheldrick, 2001)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2001)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART APEXII CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.078
_diffrn_reflns_av_sigmaI/netI    0.067
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            14847
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         2.09
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.987
_exptl_absorpt_correction_T_min  0.918
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.329
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'square prism'
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.27
_refine_diff_density_min         -0.22
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.001
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     228
_refine_ls_number_reflns         3413
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.001
_refine_ls_R_factor_all          0.0939
_refine_ls_R_factor_gt           0.0466
_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^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0933
_refine_ls_wR_factor_ref         0.1108
_reflns_number_gt                2184
_reflns_number_total             3413
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bm3039.cif
_cod_data_source_block           IV
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2016307
_cod_database_fobs_code          2016307