Dibutyl 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, Diisobutyl 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate and Di-<i>tert</i>-butyl 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate
Rowan, K. R.; Holt, E. M.; Acta Crystallographica Section C 52 (1996) 2207–2212; doi:10.1107/S0108270196003551

data_2005415
_publ_section_title
;
 Dibutyl
 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate,
 Diisobutyl
 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate
 and Di-<i>tert</i>-butyl
 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate
;
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              2207
_journal_page_last               2212
_journal_paper_doi               10.1107/S0108270196003551
_journal_volume                  52
_journal_year                    1996
_chemical_formula_moiety         'C23 H30 N2 O6'
_chemical_formula_sum            'C23 H30 N2 O6'
_chemical_formula_weight         430.5
_chemical_melting_point          141
_chemical_name_systematic
;
Di-isobutyl
2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_cell_angle_alpha                99.29(1)
_cell_angle_beta                 97.27(1)
_cell_angle_gamma                116.35(1)
_cell_formula_units_Z            2
_cell_length_a                   9.715(1)
_cell_length_b                   10.932(1)
_cell_length_c                   12.501(1)
_cell_measurement_reflns_used    41
_cell_measurement_temperature    298
_cell_measurement_theta_max      12.402
_cell_measurement_theta_min      4.151
_cell_volume                     1144.2(2)
_computing_cell_refinement       XSCANS
_computing_data_collection       'XSCANS (Siemens, 1991)'
_computing_data_reduction        XSCANS
_computing_molecular_graphics    'XP (Siemens, 1990)'
_computing_structure_refinement  'SHELXL93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298
_diffrn_measurement_device       'Siemens P4 four-circle'
_diffrn_measurement_method       \q/2\q
_diffrn_radiation_monochromator  'highly oriented graphite crystal'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0267
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2623
_diffrn_reflns_theta_max         19.98
_diffrn_reflns_theta_min         2.14
_diffrn_standards_decay_%        0.19
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.249
_exptl_crystal_description       chunk
_exptl_crystal_F_000             460
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.526
_refine_diff_density_min         -0.249
_refine_ls_extinction_coef       0.019(8)
_refine_ls_extinction_method     'SHELXL93 (Sheldrick 1993)'
_refine_ls_goodness_of_fit_all   1.047
_refine_ls_goodness_of_fit_obs   1.113
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     291
_refine_ls_number_reflns         2030
_refine_ls_restrained_S_all      1.258
_refine_ls_restrained_S_obs      1.113
_refine_ls_R_factor_all          0.0776
_refine_ls_R_factor_obs          0.0574
_refine_ls_shift/esd_max         -0.057
_refine_ls_shift/esd_mean        0.005
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_scheme
;
calc w = 1/[\s^2^(F~o~^2^) + (0.1127P)^2^ + 0.3691P]
where P = (F~o~^2^ + 2F~c~^2^)/3
;
_refine_ls_wR_factor_all         0.2092
_refine_ls_wR_factor_obs         0.1595
_reflns_number_observed          1557
_reflns_number_total             2116
_reflns_observed_criterion       F>4.0\s(F)
_cod_data_source_file            pa1223.cif
_cod_data_source_block           II
_cod_database_code               2005415