<i>rac</i>-(4a<i>R</i>,8a<i>R</i>)-2,3-Diphenyl-4a,5,6,7,8,8a-hexahydroquinoxaline
Chen, Fang; Ye, Heng-Yun; Acta Crystallographica Section E 64 (2008) o1191–; doi:10.1107/S1600536808016103

data_2218682
_publ_section_title
<i>rac</i>-(4a<i>R</i>,8a<i>R</i>)-2,3-Diphenyl-4a,5,6,7,8,8a-hexahydroquinoxaline
_journal_coeditor_code           FB2093
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1191
_journal_paper_doi               10.1107/S1600536808016103
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C20 H20 N2'
_chemical_formula_moiety         'C20 H20 N2'
_chemical_formula_sum            'C20 H20 N2'
_chemical_formula_weight         288.38
_chemical_melting_point_gt       447
_chemical_melting_point_lt       453
_chemical_name_systematic
;
<i>rac</i>-(4a<i>R</i>,8a<i>R</i>)-2,3-Diphenyl-4a,5,6,7,8,8a-
hexahydroquinoxaline
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.278(3)
_cell_length_b                   18.388(4)
_cell_length_c                   5.6638(11)
_cell_measurement_reflns_used    13431
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      3.32
_cell_volume                     1591.1(6)
_computing_cell_refinement       'CrystalClear (Rigaku, 2005)'
_computing_data_collection       'CrystalClear (Rigaku, 2005)'
_computing_data_reduction        'CrystalClear (Rigaku, 2005)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 13.6612
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Rigaku SCXmini'
_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  0.0711
_diffrn_reflns_av_sigmaI/netI    0.0395
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            16117
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.47
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.071
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8305
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(CrystalClear; Rigaku, 2005)'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.204
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             616
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.129
_refine_diff_density_min         -0.165
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.101
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_constraints    80
_refine_ls_number_parameters     199
_refine_ls_number_reflns         2004
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.101
_refine_ls_R_factor_all          0.0664
_refine_ls_R_factor_gt           0.0474
_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^)+(0.0344P)^2^+0.1949P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0925
_refine_ls_wR_factor_ref         0.0999
_reflns_number_gt                1558
_reflns_number_total             2004
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fb2093.cif
_cod_data_source_block           I
_cod_original_cell_volume        1591.2(5)
_cod_database_code               2218682
_cod_database_fobs_code          2218682