Influence of a [Me2Si] ansa bridge on the barrier to rotation about the Zr‒phenyl bond and on the generation and reactivity of benzyne intermediates: comparison of the structures and reactivity of [Me2Si(C5Me4)2]Zr(Ph)X and Cp*2Zr(Ph)X (X = H, Cl, Ph)
Lee, Hyosun; Bridgewater, Brian M.; Parkin, Gerard; Journal of the Chemical Society, Dalton Transactions  (2000) 4490–; doi:10.1039/b005117i

data_7010023
_publ_section_title
;
 Influence of a [Me2Si] ansa bridge on the barrier to rotation about
 the Zr--phenyl bond and on the generation and reactivity of benzyne
 intermediates: comparison of the structures and reactivity of
 [Me2Si(C5Me4)2]Zr(Ph)X and Cp*2Zr(Ph)X (X&#x2005;=&#x2005;H, Cl, Ph)
;
_journal_issue                   24
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              4490
_journal_paper_doi               10.1039/b005117i
_journal_year                    2000
_chemical_formula_sum            'C26 H35 Cl Si Zr'
_chemical_formula_weight         502.30
_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                90.00
_cell_angle_beta                 91.1940(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.6955(4)
_cell_length_b                   12.4482(6)
_cell_length_c                   20.4091(9)
_cell_measurement_temperature    203(2)
_cell_volume                     2462.67(19)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      203(2)
_diffrn_measured_fraction_theta_full 0.927
_diffrn_measured_fraction_theta_max 0.927
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0359
_diffrn_reflns_av_sigmaI/netI    0.0342
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            17993
_diffrn_reflns_theta_full        28.34
_diffrn_reflns_theta_max         28.34
_diffrn_reflns_theta_min         1.92
_exptl_absorpt_coefficient_mu    0.614
_exptl_absorpt_correction_T_max  0.9700
_exptl_absorpt_correction_T_min  0.8871
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.355
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1048
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.329
_refine_diff_density_min         -0.288
_refine_diff_density_rms         0.061
_refine_ls_extinction_coef       0.00000(19)
_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_ref   1.024
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     273
_refine_ls_number_reflns         5689
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.0467
_refine_ls_R_factor_gt           0.0320
_refine_ls_shift/su_max          0.119
_refine_ls_shift/su_mean         0.003
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0419P)^2^+0.7821P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0765
_refine_ls_wR_factor_ref         0.0829
_reflns_number_gt                4560
_reflns_number_total             5689
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b005117i.txt
_cod_data_source_block           azrs20
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7010023