Facile Synthesis of a Tungsten Alkylidyne Catalyst for Alkyne Metathesis
Tonzetich, Zachary J.; Lam, Yan Choi; Müller, Peter; Schrock, Richard R.; Organometallics 26 (2007) 475–; doi:10.1021/om0610647

data_4072816
_publ_section_title
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 Facile Synthesis of a Tungsten Alkylidyne Catalyst for Alkyne Metathesis
;
_journal_issue                   3
_journal_name_full               Organometallics
_journal_page_first              475
_journal_paper_doi               10.1021/om0610647
_journal_volume                  26
_journal_year                    2007
_chemical_formula_sum            'C34 H54 O2 W'
_chemical_formula_weight         678.62
_chemical_name_systematic
;

 ?

;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   11.5297(4)
_cell_length_b                   19.4678(6)
_cell_length_c                   29.0284(9)
_cell_measurement_reflns_used    9164
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.47
_cell_measurement_theta_min      2.17
_cell_volume                     6515.7(4)
_computing_cell_refinement       'SAINT 7 (Bruker-AXS, 2005)'
_computing_data_collection       'SMART 5 (Bruker-AXS, 2003)'
_computing_data_reduction        'SAINT 7 (Bruker-AXS, 2005)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker Smart APEX CCD'
_diffrn_measurement_method       'omega and phi 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  0.0381
_diffrn_reflns_av_sigmaI/netI    0.0177
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       40
_diffrn_reflns_limit_l_min       -40
_diffrn_reflns_number            108715
_diffrn_reflns_theta_full        29.57
_diffrn_reflns_theta_max         29.57
_diffrn_reflns_theta_min         2.09
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.572
_exptl_absorpt_correction_T_max  0.6164
_exptl_absorpt_correction_T_min  0.4688
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2005)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.384
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2784
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         1.682
_refine_diff_density_min         -0.469
_refine_diff_density_rms         0.098
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.048
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     354
_refine_ls_number_reflns         9132
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.048
_refine_ls_R_factor_all          0.0290
_refine_ls_R_factor_gt           0.0222
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0282P)^2^+5.8750P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0523
_refine_ls_wR_factor_ref         0.0557
_reflns_number_gt                7806
_reflns_number_total             9132
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om0610647si20061120_034844.cif
_cod_data_source_block           06174
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               4072816