Four 2-aryl-8,8-dimethyl-6,7,8,9-tetrahydropyrazolo[2,3-<i>a</i>]quinazolin-6-ones: isolated molecules, hydrogen-bonded dimers, and π-stacked chains of hydrogen-bonded dimers
Cruz, Silvia; Quiroga, Jairo; de la Torre, José M.; Cobo, Justo; Low, John N.; Glidewell, Christopher; Acta Crystallographica Section C 62 (2006) o364–o368; doi:10.1107/S0108270106017598

data_2015391
_publ_section_title
;Four
 2-aryl-8,8-dimethyl-6,7,8,9-tetrahydropyrazolo[2,3-<i>a</i>]quinazolin-6-ones:
 isolated molecules, hydrogen-bonded dimers, and \p-stacked chains of
 hydrogen-bonded dimers
;
_journal_coeditor_code           SK3026
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o364
_journal_page_last               o368
_journal_paper_doi               10.1107/S0108270106017598
_journal_volume                  62
_journal_year                    2006
_chemical_formula_iupac          'C20 H21 N3 O2'
_chemical_formula_moiety         'C20 H21 N3 O2'
_chemical_formula_sum            'C20 H21 N3 O2'
_chemical_formula_weight         335.40
_chemical_name_systematic
;
2-(4-Methoxyphenyl)-5,8,8-trimethyl-6,7,8,9-
tetrahydropyrazolo[2,3-a]quinazolin-6-one
;
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 101.094(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.7659(6)
_cell_length_b                   8.5730(2)
_cell_length_c                   11.3982(3)
_cell_measurement_reflns_used    3886
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      2.99
_cell_volume                     1703.58(8)
_computing_cell_refinement       'DENZO (Otwinowski & Minor, 1997) and COLLECT'
_computing_data_collection       'COLLECT (Nonius, 1999)'
_computing_data_reduction        'DENZO and COLLECT'
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  'SHELXL97 and PRPKAPPA (Ferguson, 1999)'
_computing_structure_refinement
'OSCAIL (McArdle, 2003) and SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution
'SIR2004 (Burla <i>et al.</i>,  2005) and WinGX (Farrugia, 1999)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Nonius KappaCCD area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Bruker Nonius FR591 rotating anode'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0421
_diffrn_reflns_av_sigmaI/netI    0.0452
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            14346
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.99
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.993
_exptl_absorpt_correction_T_min  0.956
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.308
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             712
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.178
_refine_diff_density_min         -0.218
_refine_ls_extinction_coef       0.025(7)
_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   1.066
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     231
_refine_ls_number_reflns         3886
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.066
_refine_ls_R_factor_all          0.0783
_refine_ls_R_factor_gt           0.0533
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0712P)^2^+0.3779P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1341
_refine_ls_wR_factor_ref         0.1526
_reflns_number_gt                2825
_reflns_number_total             3886
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3026.cif
_cod_data_source_block           II
_cod_original_cell_volume        1703.56(8)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2015391