Synthesis and Properties of Bridgehead-Functionalized Permethylbicyclo[2.2.2]octasilanes.
Stueger, Harald; Hasken, Bernd; Gross, Uwe; Fischer, Roland; Torvisco Gomez, Ana; Organometallics 32 (2013) 4490–4500; doi:10.1021/om400184y

data_4081223
_publ_section_title
;
 Synthesis and Properties of Bridgehead-Functionalized
 Permethylbicyclo[2.2.2]octasilanes.
;
_journal_issue                   16
_journal_name_full               Organometallics
_journal_page_first              4490
_journal_page_last               4500
_journal_paper_doi               10.1021/om400184y
_journal_volume                  32
_journal_year                    2013
_chemical_formula_sum            'C28 H58 Si10'
_chemical_formula_weight         675.64
_chemical_name_systematic
; 
Dodecamethyl-4-(trimethylsilyl)-1-(methyldiphenylsilyl)bicyclo[2.2.2]octasilane
;
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_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                   17.2861(4)
_cell_length_b                   27.2812(6)
_cell_length_c                   17.5884(4)
_cell_measurement_reflns_used    9670
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.10
_cell_measurement_theta_min      2.32
_cell_volume                     8294.4(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \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  0.0601
_diffrn_reflns_av_sigmaI/netI    0.0331
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            251929
_diffrn_reflns_theta_full        27.10
_diffrn_reflns_theta_max         27.10
_diffrn_reflns_theta_min         2.23
_exptl_absorpt_coefficient_mu    0.334
_exptl_absorpt_correction_T_max  0.74
_exptl_absorpt_correction_T_min  0.67
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'R. Blessing, Acta Cryst. (1995) A51 33-38.'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.082
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2928
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.554
_refine_diff_density_min         -0.329
_refine_diff_density_rms         0.057
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.07(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.055
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     717
_refine_ls_number_reflns         8708
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.055
_refine_ls_R_factor_all          0.0521
_refine_ls_R_factor_gt           0.0364
_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^)+(0.0426P)^2^+3.8506P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0806
_refine_ls_wR_factor_ref         0.0884
_reflns_number_gt                15656
_reflns_number_total             15656
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om400184y_si_001.cif
_cod_data_source_block           at87(2)
_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 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      'Pca2(1) '
_cod_database_code               4081223