Ethyl 5-methylimidazo[1,2-<i>a</i>]pyridine-2-carboxylate
Yao, Jin-hua; Wang, Lan-fang; Guo, Bing; An, Kang; Guan, Jian-ning; Acta Crystallographica Section E 66 (2010) o1999–; doi:10.1107/S1600536810026577

data_2226944
_publ_section_title
;
 Ethyl 5-methylimidazo[1,2-<i>a</i>]pyridine-2-carboxylate
;
_journal_coeditor_code           IM2214
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1999
_journal_paper_doi               10.1107/S1600536810026577
_journal_volume                  66
_journal_year                    2010
_chemical_formula_iupac          'C11 H12 N2 O2'
_chemical_formula_moiety         'C11 H12 N2 O2'
_chemical_formula_sum            'C11 H12 N2 O2'
_chemical_formula_weight         204.23
_chemical_melting_point_gt       425
_chemical_melting_point_lt       426
_chemical_name_systematic
;
Ethyl 5-methylimidazo[1,2-<i>a</i>]pyridine-2-carboxylate
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 124.77(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   17.164(3)
_cell_length_b                   10.521(2)
_cell_length_c                   13.759(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      13
_cell_measurement_theta_min      9
_cell_volume                     2041.0(10)
_computing_cell_refinement       'CAD-4 EXPRESS (Enraf-Nonius, 1994)'
_computing_data_collection       'CAD-4 EXPRESS (Enraf-Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\q
_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  0.0281
_diffrn_reflns_av_sigmaI/netI    0.0294
_diffrn_reflns_limit_h_max       0
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            1923
_diffrn_reflns_theta_full        25.28
_diffrn_reflns_theta_max         25.28
_diffrn_reflns_theta_min         2.42
_diffrn_standards_decay_%        1
_diffrn_standards_interval_count 200
_diffrn_standards_interval_time  120
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  0.9907
_exptl_absorpt_correction_T_min  0.9725
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(North <i>et al.</i>,  1968)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.329
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             864
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.235
_refine_diff_density_min         -0.199
_refine_ls_extinction_coef       0.0117(17)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.000
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         1859
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.000
_refine_ls_R_factor_all          0.0733
_refine_ls_R_factor_gt           0.0505
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1318
_refine_ls_wR_factor_ref         0.1515
_reflns_number_gt                1360
_reflns_number_total             1859
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            im2214.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2226944
_cod_database_fobs_code          2226944