Synthesis, Reactivity, and DFT Studies of Tantalum Complexes Incorporating Diamido-N-heterocyclic Carbene Ligands. Facile Endocyclic C-H Bond Activation
Liam P. Spencer; Chad Beddie; Michael B. Hall; Michael D. Fryzuk; Journal of the American Chemical Society 128 (2006) 12531–12543; doi:10.1021/ja063282x

data_4110906
_publ_section_title
;
 Synthesis, Reactivity, and DFT Studies of Tantalum Complexes
 Incorporating Diamido-N-heterocyclic Carbene Ligands. Facile Endocyclic
 C-H Bond Activation
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12531
_journal_page_last               12543
_journal_paper_doi               10.1021/ja063282x
_journal_volume                  128
_journal_year                    2006
_chemical_formula_moiety         'C36 H57 N8 Ta'
_chemical_formula_sum            'C36 H57 N8 Ta'
_chemical_formula_weight         782.85
_chemical_name_systematic
;
 ?
;
_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                90.000(5)
_cell_angle_beta                 87.021(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            4
_cell_length_a                   12.669(5)
_cell_length_b                   11.681(5)
_cell_length_c                   25.201(5)
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.295
_cell_measurement_theta_min      2.445
_cell_volume                     3724(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.883
_diffrn_measured_fraction_theta_max 0.883
_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  0.0245
_diffrn_reflns_av_sigmaI/netI    0.0356
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            13436
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         1.92
_exptl_absorpt_coefficient_mu    2.986
_exptl_absorpt_correction_T_max  0.6390
_exptl_absorpt_correction_T_min  0.5480
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.396
_exptl_crystal_description       fiber
_exptl_crystal_F_000             1608
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.15
_refine_diff_density_max         1.205
_refine_diff_density_min         -1.514
_refine_diff_density_rms         0.106
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     421
_refine_ls_number_reflns         7557
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0438
_refine_ls_R_factor_gt           0.0294
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0368P)^2^+0.6344P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0631
_refine_ls_wR_factor_ref         0.0661
_reflns_number_gt                6088
_reflns_number_total             7557
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja063282xsi20060510_051747.cif
_cod_data_source_block           mf559hklf4
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4110906