9,9a-Diphenyl-1,3,4,6,7,9a-hexahydro-2<i>H</i>-pyrazino[1,2-<i>a</i>]pyrimidine at 130 K
Jonathan White; W. David McFadyen; Michael Carland; William A. Denny; Vincent Murray; Acta Crystallographica Section E 62 (2006) o1846–o1848; doi:10.1107/S1600536806012463

data_2208866
_publ_section_title
;9,9a-Diphenyl-1,3,4,6,7,9a-hexahydro-2<i>H</i>-pyrazino[1,2-<i>a</i>]pyrimidine
 at 130 K
;
_journal_coeditor_code           DN2018
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1846
_journal_page_last               o1848
_journal_paper_doi               10.1107/S1600536806012463
_journal_volume                  62
_journal_year                    2006
_chemical_formula_iupac          'C19 H21 N3'
_chemical_formula_moiety         'C19 H21 N3'
_chemical_formula_sum            'C19 H21 N3'
_chemical_formula_weight         291.39
_chemical_name_systematic
;
9,9a-Diphenyl-1,3,4,6,7,9a-hexahydro-2H-pyrazino[1,2-a]pyrimidine
;
_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           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 103.4830(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.4099(7)
_cell_length_b                   8.2868(6)
_cell_length_c                   19.1371(14)
_cell_measurement_reflns_used    3216
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      27.03
_cell_measurement_theta_min      2.46
_cell_volume                     1605.4(2)
_computing_cell_refinement       'SAINT (Bruker 1999)'
_computing_data_collection       'SMART (Bruker, 2000)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Bruker, 2000)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART 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  0.0594
_diffrn_reflns_av_sigmaI/netI    0.0394
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            8199
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.01
_diffrn_standards_decay_%        0.0
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.206
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.158
_refine_diff_density_min         -0.138
_refine_ls_extinction_coef       0.0091(18)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 1997)'
_refine_ls_goodness_of_fit_ref   1.048
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     284
_refine_ls_number_reflns         2833
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.048
_refine_ls_R_factor_all          0.0476
_refine_ls_R_factor_gt           0.0385
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0552P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0974
_refine_ls_wR_factor_ref         0.1015
_reflns_number_gt                2259
_reflns_number_total             2833
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            dn2018.cif
_cod_data_source_block           2
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2208866
_cod_database_fobs_code          2208866