Synthesis and Reactivity of Several Stable 1-Silaallenes
Trommer, Martin; Miracle, Gary E.; Eichler, Barrett E.; Powell, Douglas R.; West, Robert; Organometallics 16 (1997) 5737–; doi:10.1021/om970246l

data_4078352
_publ_section_title
;
 Synthesis and Reactivity of Several Stable 1-Silaallenes
;
_journal_issue                   26
_journal_name_full               Organometallics
_journal_page_first              5737
_journal_paper_doi               10.1021/om970246l
_journal_volume                  16
_journal_year                    1997
_chemical_formula_sum            'C55 H70 O Si'
_chemical_formula_weight         775.20
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 96.450(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.1971(5)
_cell_length_b                   15.4724(4)
_cell_length_c                   16.8628(5)
_cell_measurement_reflns_used    6887
_cell_measurement_temperature    133(2)
_cell_measurement_theta_max      25.0
_cell_measurement_theta_min      3.0
_cell_volume                     4717.7(2)
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      133(2)
_diffrn_measurement_device       'Siemens P4/CCD'
_diffrn_measurement_method       'phi scan frames'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0229
_diffrn_reflns_av_sigmaI/netI    0.0398
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            20224
_diffrn_reflns_theta_max         28.27
_diffrn_reflns_theta_min         1.73
_diffrn_standards_decay_%        -0.43
_diffrn_standards_number         439
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.928
_exptl_absorpt_correction_T_min  0.764
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.091
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'transparent prism'
_exptl_crystal_F_000             1688
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.42
_exptl_crystal_size_min          0.38
_refine_diff_density_max         0.380
_refine_diff_density_min         -0.329
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.033
_refine_ls_goodness_of_fit_obs   1.071
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     514
_refine_ls_number_reflns         10041
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_restrained_S_obs      1.071
_refine_ls_R_factor_all          0.0557
_refine_ls_R_factor_obs          0.0390
_refine_ls_shift/esd_max         -0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0506P)^2^+0.9807P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1050
_refine_ls_wR_factor_obs         0.0958
_reflns_number_observed          7901
_reflns_number_total             10042
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            om5737.cif
_cod_data_source_block           compound_E-9
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0506P)^2^+0.9807P] 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^)+(0.0506P)^2^+0.9807P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4078352