A Viable Anionic N-Heterocyclic Dicarbene
Yuzhong Wang; Yaoming Xie; Mariham Y. Abraham; Pingrong Wei; Henry F. Schaefer; Paul v. R. Schleyer; Gregory H. Robinson; Journal of the American Chemical Society 132 (2010) 14370–14372; doi:10.1021/ja106631r

data_4103311
_publ_section_title
;
 A Viable Anionic N-Heterocyclic Dicarbene
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14370
_journal_page_last               14372
_journal_paper_doi               10.1021/ja106631r
_journal_volume                  132
_journal_year                    2010
_chemical_formula_sum            'C41 H66 B Li N2 O2'
_chemical_formula_weight         636.71
_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                 101.5390(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.7165(7)
_cell_length_b                   17.9698(11)
_cell_length_c                   19.7863(12)
_cell_measurement_reflns_used    6494
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      20.879
_cell_measurement_theta_min      2.236
_cell_volume                     4081.7(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'BRUKER APEX II'
_diffrn_measurement_method       'OMEGA SCAN'
_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  0.0493
_diffrn_reflns_av_sigmaI/netI    0.0334
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            44180
_diffrn_reflns_theta_full        25.39
_diffrn_reflns_theta_max         25.39
_diffrn_reflns_theta_min         2.19
_exptl_absorpt_coefficient_mu    0.061
_exptl_absorpt_correction_T_max  0.9933
_exptl_absorpt_correction_T_min  0.9848
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'BRUKER SADABS'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.036
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1400
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.247
_refine_diff_density_min         -0.181
_refine_diff_density_rms         0.031
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.005
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     498
_refine_ls_number_reflns         7473
_refine_ls_number_restraints     218
_refine_ls_restrained_S_all      1.004
_refine_ls_R_factor_all          0.0999
_refine_ls_R_factor_gt           0.0551
_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^)+(0.0799P)^2^+0.7563P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1386
_refine_ls_wR_factor_ref         0.1647
_reflns_number_gt                4573
_reflns_number_total             7473
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja106631r_si_004.cif
_cod_data_source_block           uga862_0m
_cod_database_code               4103311