Synthesis of Boriranes by Double Hydroboration Reactions of N-Heterocyclic Carbene Boranes and Dimethyl Acetylenedicarboxylate.
McFadden, Timothy R.; Fang, Cheng; Geib, Steven J.; Merling, Everett; Liu, Peng; Curran, Dennis P.; Journal of the American Chemical Society 139 (2017) 1726–1729; doi:10.1021/jacs.6b09873

data_4125490
_publ_section_title
;
 Synthesis of Boriranes by Double Hydroboration Reactions of
 N-Heterocyclic Carbene Boranes and Dimethyl Acetylenedicarboxylate.
;
_journal_issue                   5
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              1726
_journal_page_last               1729
_journal_paper_doi               10.1021/jacs.6b09873
_journal_volume                  139
_journal_year                    2017
_chemical_formula_sum            'C27 H33 B N2 O4'
_chemical_formula_weight         460.36
_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   mixed
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 118.389(2)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   18.9996(7)
_cell_length_b                   16.0499(6)
_cell_length_c                   18.9296(7)
_cell_measurement_reflns_used    9971
_cell_measurement_temperature    230(2)
_cell_measurement_theta_max      67.980
_cell_measurement_theta_min      3.825
_cell_volume                     5078.2(3)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      230(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'Bruker X8 Prospector Ultra wiuth Cu IMuS'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0387
_diffrn_reflns_av_unetI/netI     0.0238
_diffrn_reflns_Laue_measured_fraction_full 0.986
_diffrn_reflns_Laue_measured_fraction_max 0.985
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            60235
_diffrn_reflns_point_group_measured_fraction_full 0.986
_diffrn_reflns_point_group_measured_fraction_max 0.985
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.319
_diffrn_reflns_theta_min         2.643
_exptl_absorpt_coefficient_mu    0.638
_exptl_absorpt_correction_T_max  0.96
_exptl_absorpt_correction_T_min  0.88
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker Sadabs'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.204
_exptl_crystal_description       'rectangular prism'
_exptl_crystal_F_000             1968
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.150
_exptl_crystal_size_min          0.070
_refine_diff_density_max         0.216
_refine_diff_density_min         -0.276
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.416
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     653
_refine_ls_number_reflns         9181
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.416
_refine_ls_R_factor_all          0.0511
_refine_ls_R_factor_gt           0.0425
_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^)+(0.0680P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1254
_refine_ls_wR_factor_ref         0.1311
_reflns_Friedel_coverage         0.000
_reflns_number_gt                7683
_reflns_number_total             9181
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja6b09873_si_003.cif
_cod_data_source_block           mcfadden60216a_a
_cod_depositor_comments
'Adding full bibliography for 4125488--4125491.cif.'
_cod_database_code               4125490
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.883
_shelx_estimated_absorpt_t_max   0.957
_shelx_res_checksum              90783
_shelx_hkl_checksum              9682