Facile Route to Quadruply Annulated Borepins.
Schickedanz, Kai; Radtke, Julian; Bolte, Michael; Lerner, Hans-Wolfram; Wagner, Matthias; Journal of the American Chemical Society 139 (2017) 2842–2851; doi:10.1021/jacs.7b00268

data_4125506
_publ_section_title
;
 Facile Route to Quadruply Annulated Borepins.
;
_journal_issue                   7
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              2842
_journal_page_last               2851
_journal_paper_doi               10.1021/jacs.7b00268
_journal_volume                  139
_journal_year                    2017
_chemical_formula_moiety         'C26 H17 B Br2'
_chemical_formula_sum            'C26 H17 B Br2'
_chemical_formula_weight         500.02
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 98.845(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   18.4101(7)
_cell_length_b                   13.6050(4)
_cell_length_c                   8.2544(3)
_cell_measurement_reflns_used    55444
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      26.42
_cell_measurement_theta_min      2.23
_cell_volume                     2042.89(12)
_computing_cell_refinement       'X-Area (Stoe & Cie, 2001)'
_computing_data_collection       'X-Area (Stoe & Cie, 2001)'
_computing_data_reduction        'X-Area (Stoe & Cie, 2001)'
_computing_molecular_graphics    'XP in SHELXTL-Plus (Sheldrick, 2008)'
_computing_publication_material  SHELXL
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'STOE IPDS II two-circle-diffractometer'
_diffrn_measurement_method       \w
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0678
_diffrn_reflns_av_unetI/netI     0.0279
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            55444
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         25.957
_diffrn_reflns_theta_min         2.239
_diffrn_source                   'Genix 3D I\mS microfocus X-ray source'
_exptl_absorpt_coefficient_mu    3.978
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.613
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'X-Area (Stoe & Cie, 2001)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.626
_exptl_crystal_description       block
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.230
_exptl_crystal_size_mid          0.180
_exptl_crystal_size_min          0.130
_refine_diff_density_max         0.385
_refine_diff_density_min         -0.492
_refine_diff_density_rms         0.090
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.149
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     262
_refine_ls_number_reflns         3976
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.149
_refine_ls_R_factor_all          0.0575
_refine_ls_R_factor_gt           0.0457
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0357P)^2^+6.1743P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1084
_refine_ls_wR_factor_ref         0.1123
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3344
_reflns_number_total             3976
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b00268_si_002.cif
_cod_data_source_block           wa2326
_cod_depositor_comments
'Adding full bibliography for 4125504--4125509.cif.'
_cod_database_code               4125506
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.461
_shelx_estimated_absorpt_t_max   0.626
_shelx_res_checksum              52473
_shelx_hkl_checksum              63055