A Stable Neutral Diborene Containing a BB Double Bond
Yuzhong Wang; Brandon Quillian; Pingrong Wei; Chaitanya S. Wannere; Yaoming Xie; R. Bruce King; Henry F. Schaefer; Paul V. R. Schleyer; Gregory H. Robinson; Journal of the American Chemical Society 129 (2007) 12412–12413; doi:10.1021/ja075932i

data_4110030
_publ_section_title
;
 A Stable Neutral Diborene Containing a BB Double Bond
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12412
_journal_page_last               12413
_journal_paper_doi               10.1021/ja075932i
_journal_volume                  129
_journal_year                    2007
_chemical_formula_sum            'C54 H76 B2 N4'
_chemical_formula_weight         802.80
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 110.296(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   12.8024(17)
_cell_length_b                   14.372(2)
_cell_length_c                   14.466(2)
_cell_measurement_temperature    273(2)
_cell_volume                     2496.4(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      273(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.0474
_diffrn_reflns_av_sigmaI/netI    0.0345
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            33107
_diffrn_reflns_theta_full        27.88
_diffrn_reflns_theta_max         27.88
_diffrn_reflns_theta_min         2.21
_exptl_absorpt_coefficient_mu    0.061
_exptl_absorpt_correction_T_max  0.9970
_exptl_absorpt_correction_T_min  0.9820
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'BRUKER SADABS'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.068
_exptl_crystal_F_000             876
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.192
_refine_diff_density_min         -0.192
_refine_diff_density_rms         0.032
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.014
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     279
_refine_ls_number_reflns         5941
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.0971
_refine_ls_R_factor_gt           0.0532
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0677P)^2^+0.4874P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1294
_refine_ls_wR_factor_ref         0.1548
_reflns_number_gt                3593
_reflns_number_total             5941
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja075932isi20070807_123445.cif
_cod_data_source_block           uga613
_cod_database_code               4110030