Synthesis and Decomposition of Alkyl Complexes of Molybdenum(IV) That Contain a [(Me3SiNCH2CH2)3N]3- Ligand. Direct Detection of α-Elimination Processes That Are More than Six Orders of Magnitude Faster than β-Elimination Processes
Richard R. Schrock; Scott W. Seidel; Nadia C. Mösch-Zanetti; Keng-Yu Shih; Myra B. O'Donoghue; William M. Davis; William M. Reiff; Journal of the American Chemical Society 119 (1997) 11876–11893; doi:10.1021/ja970697x

data_4117074
_publ_section_title
;
 Synthesis and Decomposition of Alkyl Complexes of Molybdenum(IV) That
 Contain a [(Me3SiNCH2CH2)3N]3- Ligand. Direct Detection of \a-Elimination
 Processes That Are More than Six Orders of Magnitude Faster than
 \b-Elimination Processes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11876
_journal_page_last               11893
_journal_paper_doi               10.1021/ja970697x
_journal_volume                  119
_journal_year                    1997
_chemical_formula_sum            'C21 H50 Mo N4 Si3'
_chemical_formula_weight         538.86
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           173
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  'P 6c'
_symmetry_space_group_name_H-M   'P 63'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            6
_cell_length_a                   20.820(6)
_cell_length_b                   20.820(6)
_cell_length_c                   11.680(5)
_cell_measurement_temperature    183(2)
_cell_volume                     4385(3)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      183(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       '\w scans'
_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  0.1181
_diffrn_reflns_av_sigmaI/netI    0.0605
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            12846
_diffrn_reflns_theta_max         20.00
_diffrn_reflns_theta_min         1.13
_exptl_absorpt_coefficient_mu    0.586
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.224
_exptl_crystal_F_000             1728
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.653
_refine_diff_density_min         -0.421
_refine_diff_density_rms         0.082
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.43(10)
_refine_ls_extinction_coef       0.0003(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_all   1.113
_refine_ls_goodness_of_fit_obs   1.142
_refine_ls_matrix_type           full
_refine_ls_number_parameters     259
_refine_ls_number_reflns         2679
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.224
_refine_ls_restrained_S_obs      1.142
_refine_ls_R_factor_all          0.0670
_refine_ls_R_factor_obs          0.0569
_refine_ls_shift/esd_max         0.003
_refine_ls_shift/esd_mean        0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0522P)^2^+13.5431P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1702
_refine_ls_wR_factor_obs         0.1488
_reflns_number_observed          2417
_reflns_number_total             2728
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ja970697x_1.cif
_cod_data_source_block           96208
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0522P)^2^+13.5431P] where P=(Fo^2^+2Fc^2^)/3'
was changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0522P)^2^+13.5431P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        4384.8(26)
_cod_database_code               4117074