Dimethyl 2,6-Dimethyl-4-(3-nitrophenyl)-pyridine-3,5-dicarboxylate, Diethyl 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and Diethyl 2,6-Dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate
Rowan, K. R.; Holt, E. M.; Acta Crystallographica Section C 52 (1996) 1565–1570; doi:10.1107/S0108270196000091

data_2004976
_publ_section_title
;
 Dimethyl 2,6-Dimethyl-4-(3-nitrophenyl)-pyridine-3,5-dicarboxylate,
 Diethyl
 2,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate,
 and Diethyl 2,6-Dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1565
_journal_page_last               1570
_journal_paper_doi               10.1107/S0108270196000091
_journal_volume                  52
_journal_year                    1996
_chemical_formula_moiety         'C19 H20 N2 O6'
_chemical_formula_sum            'C19 H20 N2 O6'
_chemical_formula_weight         372.37
_chemical_name_systematic
;
   diethyl 2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylate
;
_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'
_cell_angle_alpha                90.00
_cell_angle_beta                 109.920(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.0180(10)
_cell_length_b                   19.517(2)
_cell_length_c                   8.6060(10)
_cell_measurement_reflns_used    53
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      12.008
_cell_measurement_theta_min      4.174
_cell_volume                     1897.8(4)
_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      293(2)
_diffrn_measurement_device       'Siemens P4 4-circle-diffractometer'
_diffrn_measurement_method       \q/2\q
_diffrn_radiation_monochromator  'highly oriented graphite crystal'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0552
_diffrn_reflns_av_sigmaI/netI    0.1105
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       1
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            2402
_diffrn_reflns_theta_max         20.0
_diffrn_reflns_theta_min         1.8
_diffrn_standards_decay_%        2.0
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            plate
_exptl_crystal_density_diffrn    1.303
_exptl_crystal_description       clear
_exptl_crystal_F_000             784
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.137
_refine_diff_density_min         -0.148
_refine_ls_extinction_coef       0.0016(11)
_refine_ls_extinction_method     'SHELXL93 (Sheldrick 1993)'
_refine_ls_goodness_of_fit_all   0.984
_refine_ls_goodness_of_fit_obs   1.134
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     245
_refine_ls_number_reflns         1706
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.161
_refine_ls_restrained_S_obs      1.134
_refine_ls_R_factor_all          0.1452
_refine_ls_R_factor_obs          0.0587
_refine_ls_shift/esd_max         -0.003
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0500P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1605
_refine_ls_wR_factor_obs         0.1064
_reflns_number_observed          890
_reflns_number_total             1767
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            fg1105.cif
_cod_data_source_block           III
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc w =
1/[\s^2^(Fo^2^)+(0500P)^2^] where P=(Fo^2^+2Fc^2^)/3' was changed to
'calc'. New tag '_refine_ls_weighting_details' was created. The value
of the new tag was set to 'w = 1/[\s^2^(Fo^2^)+(0500P)^2^] where
P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1897.8(3)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2004976