TMSOTf-catalyzed synthesis of trisubstituted imidazoles using hexamethyldisilazane as a nitrogen source under neat and microwave irradiation conditions
Asressu, Kesatebrhan Haile; Chan, Chieh-Kai; Wang, Cheng-Chung; RSC Advances 11 (2021) 28061–28071; doi:10.1039/D1RA05802A

data_7243398
_publ_section_title
;
 TMSOTf-catalyzed synthesis of trisubstituted imidazoles using
 hexamethyldisilazane as a nitrogen source under neat and microwave
 irradiation conditions
;
_journal_issue                   45
_journal_name_full               'RSC Advances'
_journal_page_first              28061
_journal_page_last               28071
_journal_paper_doi               10.1039/D1RA05802A
_journal_volume                  11
_journal_year                    2021
_chemical_formula_moiety         'C19 H20 N2'
_chemical_formula_sum            'C19 H20 N2'
_chemical_formula_weight         276.37
_space_group_crystal_system      orthorhombic
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_space_group_name_H-M_alt        'P b c a'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2021-07-21 deposited with the CCDC.	2021-08-12 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   16.5878(5)
_cell_length_b                   9.2549(3)
_cell_length_c                   20.0075(6)
_cell_measurement_reflns_used    9938
_cell_measurement_temperature    100.0(2)
_cell_measurement_theta_max      26.73
_cell_measurement_theta_min      2.38
_cell_volume                     3071.52(16)
_computing_cell_refinement       'SAINT V8.40A (Bruker Nano, Inc., 2019)'
_computing_data_collection       'Bruker Instrument Service v2012.12.0.3'
_computing_data_reduction        'SAINT V8.40A (Bruker Nano, Inc., 2019)'
_computing_molecular_graphics    'shelXle (C.B. Huebschle, rev 958)'
_computing_publication_material  'WinGX publication routines (Farrugia, 2014)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100.0(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker D8 Venture PhotonIII'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0853
_diffrn_reflns_av_unetI/netI     0.0263
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            61188
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.101
_diffrn_reflns_theta_min         2.036
_exptl_absorpt_coefficient_mu    0.070
_exptl_absorpt_correction_T_max  1
_exptl_absorpt_correction_T_min  0.8011
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'Bruker SADABS, 1996'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.195
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1184
_exptl_crystal_size_max          0.317
_exptl_crystal_size_mid          0.169
_exptl_crystal_size_min          0.167
_refine_diff_density_max         0.240
_refine_diff_density_min         -0.210
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     191
_refine_ls_number_reflns         3375
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.056
_refine_ls_R_factor_all          0.0529
_refine_ls_R_factor_gt           0.0398
_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^)+(0.0357P)^2^+1.4127P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0900
_refine_ls_wR_factor_ref         0.0972
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2731
_reflns_number_total             3375
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1ra05802a2.cif
_cod_data_source_block           i18259
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_crystal_density_meas' value 'none' was changed to
'?' -- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 7556 2019-12-06 15:28:31Z antanas 
;
_cod_database_code               7243398
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.978
_shelx_estimated_absorpt_t_max   0.988
_shelx_res_checksum              40366