1,4-Bis(trimethylsilyl)-1,4-diaza-2,5-cyclohexadienes as Strong Salt-Free Reductants for Generating Low-Valent Early Transition Metals with Electron-Donating Ligands.
Saito, Teruhiko; Nishiyama, Haruka; Tanahashi, Hiromasa; Kawakita, Kento; Tsurugi, Hayato; Mashima, Kazushi; Journal of the American Chemical Society 136 (2014) 5161–5170; doi:10.1021/ja501313s

data_4121615
_publ_section_title
;
 1,4-Bis(trimethylsilyl)-1,4-diaza-2,5-cyclohexadienes as Strong Salt-Free
 Reductants for Generating Low-Valent Early Transition Metals with
 Electron-Donating Ligands.
;
_journal_issue                   13
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5161
_journal_page_last               5170
_journal_paper_doi               10.1021/ja501313s
_journal_volume                  136
_journal_year                    2014
_chemical_formula_moiety         'C50 H68 Cl2 N2 Ti2'
_chemical_formula_sum            'C50 H68 Cl2 N2 Ti2'
_chemical_formula_weight         863.76
_chemical_name_common            21
_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                 91.893(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.7094(7)
_cell_length_b                   17.3646(13)
_cell_length_c                   14.8216(11)
_cell_measurement_reflns_used    4333
_cell_measurement_temperature    113(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      3.31
_cell_volume                     2240.3(3)
_computing_cell_refinement       CrystalClear
_computing_data_collection       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_reduction        CrystalClear
_computing_molecular_graphics    'CrystalStructure 4.0'
_computing_publication_material  'CrystalStructure 4.0 (Rigaku, 2010)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      113(2)
_diffrn_detector_area_resol_mean 7.314
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Rigaku Mercury70'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0578
_diffrn_reflns_av_sigmaI/netI    0.0541
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            21322
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.56
_diffrn_standards_interval_time  0
_diffrn_standards_number         21322
_exptl_absorpt_coefficient_mu    0.512
_exptl_absorpt_correction_T_max  0.9651
_exptl_absorpt_correction_T_min  0.8534
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'REQAB (Rigaku, 1998)'
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    1.280
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             920
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.672
_refine_diff_density_min         -0.575
_refine_diff_density_rms         0.086
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.249
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     263
_refine_ls_number_reflns         5114
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.249
_refine_ls_R_factor_all          0.0918
_refine_ls_R_factor_gt           0.0808
_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^)+(0.0651P)^2^+2.5563P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1748
_refine_ls_wR_factor_ref         0.1836
_reflns_number_gt                4543
_reflns_number_total             5114
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja501313s_si_003.cif
_cod_data_source_block           9
_cod_database_code               4121615