Hexamethylbenzene elimination enables the generation of transient, sterically unhindered multiply bonded boron species
Zhang, Chonghe; Dabringhaus, Philipp; Tra, Bi Youan E.; Gilliard, Robert J.; Cummins, Christopher C.; Chemical Science 16 (2025) 11841–11848; doi:10.1039/D5SC02645H

data_1574653
_publ_section_title
;
 Hexamethylbenzene elimination enables the generation of transient,
 sterically unhindered multiply bonded boron species
;
_journal_issue                   26
_journal_name_full               'Chemical Science'
_journal_page_first              11841
_journal_page_last               11848
_journal_paper_doi               10.1039/D5SC02645H
_journal_volume                  16
_journal_year                    2025
_chemical_formula_moiety         'C28 H34 B N O'
_chemical_formula_sum            'C28 H34 B N O'
_chemical_formula_weight         411.37
_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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     iterative
_audit_creation_date             2023-10-16
_audit_creation_method
;
Olex2 1.5
(compiled 2023.08.24 svn.re1ec1418 for OlexSys, GUI svn.r6817)
;
_audit_update_record
;
2025-01-10 deposited with the CCDC.	2025-05-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 100.269(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.0019(8)
_cell_length_b                   13.4954(11)
_cell_length_c                   16.5173(12)
_cell_measurement_reflns_used    6537
_cell_measurement_temperature    100.00
_cell_measurement_theta_max      29.640
_cell_measurement_theta_min      3.019
_cell_volume                     2413.1(3)
_computing_cell_refinement       'SAINT V8.40B (?, 2016)'
_computing_data_reduction        'SAINT V8.40B (?, 2016)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL  (Sheldrick, 2008)'
_computing_structure_solution    'olex2.solve 1.5 (Bourhis et al., 2015)'
_diffrn_ambient_temperature      100.00
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0338
_diffrn_reflns_av_unetI/netI     0.0121
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            75187
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.027
_diffrn_reflns_theta_max         25.027
_diffrn_reflns_theta_min         1.881
_diffrn_source_current           1.4
_diffrn_source_power             0.07
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.067
_exptl_absorpt_correction_T_max  0.7462
_exptl_absorpt_correction_T_min  0.6935
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.1058 before and 0.0563 after correction.
The Ratio of minimum to maximum transmission is 0.9294.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.132
_exptl_crystal_description       block
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.249
_exptl_crystal_size_mid          0.246
_exptl_crystal_size_min          0.211
_refine_diff_density_max         0.310
_refine_diff_density_min         -0.256
_refine_diff_density_rms         0.072
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     289
_refine_ls_number_reflns         4255
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0497
_refine_ls_R_factor_gt           0.0475
_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^)+(0.0664P)^2^+1.2336P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1246
_refine_ls_wR_factor_ref         0.1268
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3969
_reflns_number_total             4255
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5sc02645h3.cif
_cod_data_source_block           11
_cod_depositor_comments
'Adding full bibliography for 1574650--1574657.cif.'
_cod_database_code               1574653
_shelx_shelxl_version_number     2019/1
_shelx_estimated_absorpt_t_max   0.986
_shelx_estimated_absorpt_t_min   0.984
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C14(H14), C15(H15), C16(H16), C17(H17), C18(H18), C22(H22), C25(H25)
2.b Idealised Me refined as rotating group:
 C3(H3A,H3B,H3C), C5(H5A,H5B,H5C), C7(H7A,H7B,H7C), C9(H9A,H9B,H9C), C12(H12A,
 H12B,H12C), C21(H21A,H21B,H21C), C24(H24A,H24B,H24C), C27(H27A,H27B,H27C),
 C28(H28A,H28B,H28C)
;
_shelx_res_checksum              87941
_olex2_submission_special_instructions 'No special instructions were received'