Synthesis of fused B,N-heterocycles by alkyne cleavage, NHC ring-expansion and C-H activation at a diboryne
Brueckner, Tobias; Arrowsmith, Merle; Heß, Merlin; Hammond, Kai; Müller, Marcel; Braunschweig, Holger; Chemical Communications  (2019) –; doi:10.1039/C9CC02657F

data_7123464
_publ_section_title
;
 Synthesis of fused B,N-heterocycles by alkyne cleavage, NHC
 ring-expansion and C-H activation at a diboryne
;
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/C9CC02657F
_journal_year                    2019
_chemical_formula_moiety         'C53 H72 B2 N4 Si'
_chemical_formula_sum            'C53 H72 B2 N4 Si'
_chemical_formula_weight         814.85
_chemical_properties_physical    Air-sensitive,Moisture-sensitive
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2019-04-01 deposited with the CCDC.    2019-05-14 downloaded from the CCDC.
;
_cell_angle_alpha                94.5010(10)
_cell_angle_beta                 100.3180(10)
_cell_angle_gamma                100.3410(10)
_cell_formula_units_Z            4
_cell_length_a                   14.3768(5)
_cell_length_b                   17.7360(7)
_cell_length_c                   19.9449(7)
_cell_measurement_reflns_used    9830
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.72
_cell_measurement_theta_min      2.46
_cell_volume                     4889.9(3)
_computing_cell_refinement       'Saint+ ver. V8.37A (Bruker AXS)'
_computing_data_collection       'APEX2 ver. 2014.9 (Bruker AXS)'
_computing_data_reduction        'Saint+ ver. V8.37A (Bruker AXS)'
_computing_molecular_graphics    'ShelXLe (Huebschle et all, 2011)'
_computing_publication_material  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'CMOS area detector (Photon II)'
_diffrn_detector_area_resol_mean 7.5
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Bruker D8 Quest'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'multi-layer mirror'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0473
_diffrn_reflns_av_unetI/netI     0.0302
_diffrn_reflns_Laue_measured_fraction_full 0.992
_diffrn_reflns_Laue_measured_fraction_max 0.992
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            115284
_diffrn_reflns_point_group_measured_fraction_full 0.992
_diffrn_reflns_point_group_measured_fraction_max 0.992
_diffrn_reflns_theta_full        26.000
_diffrn_reflns_theta_max         26.022
_diffrn_reflns_theta_min         2.067
_diffrn_source                   'microfocus sealed tube (Incoatec ImS)'
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6489
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SadAbs 2016/2 (Bruker AXS)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.107
_exptl_crystal_description       plate
_exptl_crystal_F_000             1768
_exptl_crystal_size_max          0.238
_exptl_crystal_size_mid          0.228
_exptl_crystal_size_min          0.189
_refine_diff_density_max         0.384
_refine_diff_density_min         -0.536
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1123
_refine_ls_number_reflns         19111
_refine_ls_number_restraints     828
_refine_ls_restrained_S_all      1.003
_refine_ls_R_factor_all          0.0660
_refine_ls_R_factor_gt           0.0487
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0639P)^2^+2.8543P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1236
_refine_ls_wR_factor_ref         0.1359
_reflns_Friedel_coverage         0.000
_reflns_number_gt                14931
_reflns_number_total             19111
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9cc02657f2.cif
_cod_data_source_block           ToBr033
_cod_database_code               7123464
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.980
_shelx_estimated_absorpt_t_max   0.984
_shelx_res_checksum              45836