Electronic and Structural Effects of Stepwise Borylation and Quaternization on Borirene Aromaticity
Holger Braunschweig; Alexander Damme; Rian D. Dewhurst; Sundargopal Ghosh; Thomas Kramer; Bernd Pfaffinger; Krzysztof Radacki; Alfredo Vargas; Journal of the American Chemical Society 135 (2013) 1903–1911; doi:10.1021/ja3110126

data_4119278
_publ_contact_author_address
; Institut f\"ur Anorganische Chemie
Universit\"at W\"urzburg
Am Hubland
97074 W\"urzburg, Germany
;
_publ_contact_author_email       H.Braunschweig@mail.uni-wuerzburg.de
_publ_contact_author_fax         +49-931-3184623
_publ_contact_author_name        'Prof. Dr. Holger Braunschweig'
_publ_contact_author_phone       +49-931-3185260
_publ_section_title
;
 Electronic and Structural Effects of Stepwise Borylation and
 Quaternization on Borirene Aromaticity
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              1903
_journal_page_last               1911
_journal_paper_doi               10.1021/ja3110126
_journal_volume                  135
_journal_year                    2013
_chemical_formula_moiety         'C21 H50 B3 N7 Si2'
_chemical_formula_sum            'C21 H50 B3 N7 Si2'
_chemical_formula_weight         489.29
_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                 90.811(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.0641(12)
_cell_length_b                   11.2963(9)
_cell_length_c                   16.6406(14)
_cell_measurement_reflns_used    9756
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.00
_cell_measurement_theta_min      2.18
_cell_volume                     3019.4(4)
_computing_cell_refinement       'Saint+ ver. 7.68A (Bruker AXS)'
_computing_data_collection       'APEX2 ver. 2010.3 (Bruker AXS)'
_computing_data_reduction        'Saint+ ver. 7.68A (Bruker AXS)'
_computing_molecular_graphics    'XP ver. 5.1 (Bruker AXS, 1998)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker X8-APEX II'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'multi-layer mirror'
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0426
_diffrn_reflns_av_sigmaI/netI    0.0198
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            100258
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.06
_diffrn_reflns_theta_min         1.27
_exptl_absorpt_coefficient_mu    0.139
_exptl_absorpt_correction_T_max  0.7453
_exptl_absorpt_correction_T_min  0.6759
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs 2008/1 (Bruker 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.076
_exptl_crystal_description       block
_exptl_crystal_F_000             1072
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.366
_refine_diff_density_min         -0.273
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     314
_refine_ls_number_reflns         5956
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0471
_refine_ls_R_factor_gt           0.0368
_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^)+(0.0432P)^2^+1.8154P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0944
_refine_ls_wR_factor_ref         0.1004
_reflns_number_gt                4990
_reflns_number_total             5956
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja3110126_si_001_9.cif
_cod_data_source_block           09
_cod_database_code               4119278