Synthesis of Functionalized 1,4-Azaborinines by the Cyclization of Di-tert-butyliminoborane and Alkynes.
Schäfer, Marius; Beattie, Nicholas A.; Geetharani, K.; Schäfer, Julian; Ewing, William C.; Krahfuß, Mirjam; Hörl, Christian; Dewhurst, Rian D.; Macgregor, Stuart A.; Lambert, Christoph; Braunschweig, Holger; Journal of the American Chemical Society 138 (2016) 8212–8220; doi:10.1021/jacs.6b04128

data_4130505
_publ_section_title
;
 Synthesis of Functionalized 1,4-Azaborinines by the Cyclization of
 Di-tert-butyliminoborane and Alkynes.
;
_journal_issue                   26
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              8212
_journal_page_last               8220
_journal_paper_doi               10.1021/jacs.6b04128
_journal_volume                  138
_journal_year                    2016
_chemical_formula_moiety         'C18 H26 B N'
_chemical_formula_sum            'C18 H26 B N'
_chemical_formula_weight         267.21
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_secondary   iterative
_audit_creation_method           SHELXL-2014/6
_cell_angle_alpha                104.809(4)
_cell_angle_beta                 94.491(4)
_cell_angle_gamma                90.355(4)
_cell_formula_units_Z            4
_cell_length_a                   5.8630(7)
_cell_length_b                   14.7829(18)
_cell_length_c                   19.258(2)
_cell_measurement_reflns_used    8825
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.69
_cell_measurement_theta_min      2.85
_cell_volume                     1608.1(3)
_computing_cell_refinement       'Saint+ ver. V8.27B (Bruker AXS)'
_computing_data_collection       'APEX2 ver. 2014.9 (Bruker AXS)'
_computing_data_reduction        'Saint+ ver. V8.27B (Bruker AXS)'
_computing_molecular_graphics    'ShelXLe (Huebschle et all, 2011)'
_computing_publication_material  'SHELXL-2014/6 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014/6 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT (Sheldrick, 2012)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'CCD area detector (Apex2)'
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker X8-APEX II'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0376
_diffrn_reflns_av_unetI/netI     0.0330
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            27993
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        26.000
_diffrn_reflns_theta_max         26.370
_diffrn_reflns_theta_min         1.097
_diffrn_source                   'rotating-anode (Nonius FR-591)'
_exptl_absorpt_coefficient_mu    0.062
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6471
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SadAbs 2012/1 (Bruker AXS)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.104
_exptl_crystal_description       block
_exptl_crystal_F_000             584
_exptl_crystal_size_max          0.270
_exptl_crystal_size_mid          0.220
_exptl_crystal_size_min          0.070
_refine_diff_density_max         0.351
_refine_diff_density_min         -0.211
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.040
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     373
_refine_ls_number_reflns         6582
_refine_ls_number_restraints     106
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0578
_refine_ls_R_factor_gt           0.0449
_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^)+(0.0594P)^2^+0.5292P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1180
_refine_ls_wR_factor_ref         0.1267
_reflns_Friedel_coverage         0.000
_reflns_number_gt                5299
_reflns_number_total             6582
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja6b04128_si_003.cif
_cod_data_source_block           4
_cod_database_code               4130505
_shelx_estimated_absorpt_t_min   0.983
_shelx_estimated_absorpt_t_max   0.996
_shelxl_version_number           2014/6
_shelx_res_checksum              24236
_shelx_hkl_checksum              2107