The influence of electron delocalization upon the stability and structure of potential N-heterocyclic carbene precursors with 1,3-diaryl-imidazolidine-4,5-dione skeletons
Hobbs, Matthew G.; Forster, Taryn D.; Borau-Garcia, Javier; Knapp, Chrissy J.; Tuononen, Heikki M.; Roesler, Roland; New Journal of Chemistry 34 (2010) 1295–; doi:10.1039/b9nj00771g

data_7053436
_publ_section_title
;
 The influence of electron delocalization upon the stability and structure
 of potential N-heterocyclic carbene precursors with
 1,3-diaryl-imidazolidine-4,5-dione skeletons
;
_journal_issue                   7
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              1295
_journal_paper_doi               10.1039/b9nj00771g
_journal_volume                  34
_journal_year                    2010
_chemical_formula_moiety         'C20 H22 N2 O3'
_chemical_formula_sum            'C20 H22 N2 O3'
_chemical_formula_weight         338.40
_chemical_name_common
2-methoxy-1,3-bis(2,6-dimethylphenyl)imidazolidine-4,5-dione
_chemical_name_systematic
;
2-methoxy-1,3-bis(2,6-dimethylphenyl)imidazolidine-4,5-dione
;
_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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 102.895(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.9920(9)
_cell_length_b                   10.1520(14)
_cell_length_c                   12.9910(15)
_cell_measurement_reflns_used    17110
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      24.02
_cell_measurement_theta_min      2.50
_cell_volume                     1798.8(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       ' \w and \f'
_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  0.1112
_diffrn_reflns_av_sigmaI/netI    0.0535
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            17110
_diffrn_reflns_theta_full        24.02
_diffrn_reflns_theta_max         24.02
_diffrn_reflns_theta_min         2.50
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_T_max  0.9983
_exptl_absorpt_correction_T_min  0.9916
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SORTAV: (Blessing, 1997)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.250
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.372
_refine_diff_density_min         -0.293
_refine_diff_density_rms         0.073
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.081
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     230
_refine_ls_number_reflns         2811
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.081
_refine_ls_R_factor_all          0.1031
_refine_ls_R_factor_gt           0.0697
_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^)+(0.0525P)^2^+4.9368P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1638
_refine_ls_wR_factor_ref         0.1944
_reflns_number_gt                2077
_reflns_number_total             2811
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b9nj00771g.txt
_cod_data_source_block           shelxl6b
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from
2011-04-26.

'_exptl_absorpt_correction_type' value 'Multi-scan'
changed to 'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_Hall     -P2ybc
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7053436