Regioselective Functionalization of 9,9-Dimethyl-9-silafluorenes by Borylation, Bromination, and Nitration.
Murai, Masahito; Nishinaka, Naoki; Kimura, Mizuki; Takai, Kazuhiko; The Journal of organic chemistry 84 (2019) 5667–5676; doi:10.1021/acs.joc.9b00598

data_4034322
_publ_section_title
;
 Regioselective Functionalization of 9,9-Dimethyl-9-silafluorenes by
 Borylation, Bromination, and Nitration.
;
_journal_issue                   9
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              5667
_journal_page_last               5676
_journal_paper_doi               10.1021/acs.joc.9b00598
_journal_volume                  84
_journal_year                    2019
_chemical_formula_moiety         'C21 H27 B O2 Si'
_chemical_formula_sum            'C21 H27 B O2 Si'
_chemical_formula_weight         350.34
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.0000
_cell_angle_beta                 93.993(6)
_cell_angle_gamma                90.0000
_cell_formula_units_Z            4
_cell_length_a                   11.610(5)
_cell_length_b                   11.921(5)
_cell_length_c                   14.947(6)
_cell_measurement_reflns_used    6931
_cell_measurement_temperature    100
_cell_measurement_theta_max      31.20
_cell_measurement_theta_min      2.30
_cell_volume                     2063.7(15)
_computing_cell_refinement       'CrystalClear-SM Expert 2.0 r16'
_computing_data_collection       'CrystalClear-SM Expert 2.0 r16 (Rigaku, 2014)'
_computing_data_reduction        'CrystalClear-SM Expert 2.0 r16'
_computing_molecular_graphics    'CrystalStructure 4.1'
_computing_publication_material  'CrystalStructure 4.1 (Rigaku, 2014)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100
_diffrn_detector_area_resol_mean 7.111
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Rigaku Saturn724'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0835
_diffrn_reflns_Laue_measured_fraction_full 0.000
_diffrn_reflns_Laue_measured_fraction_max 0.000
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            32477
_diffrn_reflns_point_group_measured_fraction_full 0.000
_diffrn_reflns_point_group_measured_fraction_max 0.000
_diffrn_reflns_theta_full        27.490
_diffrn_reflns_theta_max         27.490
_diffrn_reflns_theta_min         3.223
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.124
_exptl_absorpt_correction_T_max  0.979
_exptl_absorpt_correction_T_min  0.754
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'REQAB (Rigaku, 1998)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.128
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             752.00
_exptl_crystal_size_max          0.180
_exptl_crystal_size_mid          0.170
_exptl_crystal_size_min          0.170
_refine_diff_density_max         0.40
_refine_diff_density_min         -0.42
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.093
_refine_ls_hydrogen_treatment    constr
_refine_ls_number_parameters     226
_refine_ls_number_reflns         4731
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0724
_refine_ls_R_factor_gt           0.0544
_refine_ls_shift/su_max          0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0730P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1382
_refine_ls_wR_factor_ref         0.1496
_reflns_number_gt                3665
_reflns_number_total             4731
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            jo9b00598_si_002.cif
_cod_data_source_block           8727-Nishinaka-B
_cod_database_code               4034322