Isolation of Free Phenylide-like Carbanions with N-Heterocyclic Carbene Frameworks
Kelly E. Krahulic; Heikki M. Tuononen; Masood Parvez; Roland Roesler; Journal of the American Chemical Society 131 (2009) 5858–5865; doi:10.1021/ja9001234

data_4104242
_publ_section_title
;
 Isolation of Free Phenylide-like Carbanions with N-Heterocyclic Carbene
 Frameworks
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5858
_journal_page_last               5865
_journal_paper_doi               10.1021/ja9001234
_journal_volume                  131
_journal_year                    2009
_chemical_formula_moiety         'C31 H50 B2 N4'
_chemical_formula_sum            'C31 H50 B2 N4'
_chemical_formula_weight         500.37
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 91.090(15)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.564(3)
_cell_length_b                   14.397(5)
_cell_length_c                   20.578(5)
_cell_measurement_reflns_used    7116
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.46
_cell_measurement_theta_min      3.42
_cell_volume                     3129.1(16)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction        DENZO-SMN
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'KappaCCD (Nonius, FR540C)'
_diffrn_measurement_method       'phi\omega scans'
_diffrn_radiation_monochromator  'horizonally mounted graphite crystal'
_diffrn_radiation_source         'Enraf Nonius FR590D, fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0473
_diffrn_reflns_av_sigmaI/netI    0.0631
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            13810
_diffrn_reflns_theta_full        27.46
_diffrn_reflns_theta_max         27.46
_diffrn_reflns_theta_min         3.42
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.061
_exptl_absorpt_correction_T_max  0.9854
_exptl_absorpt_correction_T_min  0.9819
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.062
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1096
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.173
_refine_diff_density_min         -0.228
_refine_diff_density_rms         0.040
_refine_ls_extinction_coef       0.061
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     347
_refine_ls_number_reflns         7116
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.1027
_refine_ls_R_factor_gt           0.0530
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0694P)^2^+0.3118P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1216
_refine_ls_wR_factor_ref         0.1459
_reflns_number_gt                4401
_reflns_number_total             7116
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja9001234_si_003.cif
_cod_data_source_block           2c
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               4104242