Storage and release of two electrons from an electron-rich carbon-carbon bond: boron mediated reversible coupling of DMAP and 9-azajulolidine.
Cui, Yunshu; Xiang, Libo; Wang, Junyi; Li, Chunlei; Hao, Wei; Ye, Qing; Chemical communications (Cambridge, England) 56 (2020) 6794–6797; doi:10.1039/d0cc01575j

data_7126523
_publ_section_title
;
 Storage and release of two electrons from an electron-rich carbon-carbon
 bond: boron mediated reversible coupling of DMAP and 9-azajulolidine.
;
_journal_issue                   50
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              6794
_journal_page_last               6797
_journal_paper_doi               10.1039/d0cc01575j
_journal_volume                  56
_journal_year                    2020
_chemical_formula_moiety         'C36 H40 B Br N2, C12 H30 Li O6'
_chemical_formula_sum            'C48 H70 B Br Li N2 O6'
_chemical_formula_weight         868.71
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2016/6
_audit_update_record
;
2020-02-27 deposited with the CCDC.	2020-05-12 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.9156(7)
_cell_length_b                   19.1434(11)
_cell_length_c                   19.3790(12)
_cell_measurement_reflns_used    9819
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.16
_cell_measurement_theta_min      2.36
_cell_volume                     4791.4(5)
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.998
_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  0.0841
_diffrn_reflns_av_unetI/netI     0.0444
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            107696
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.409
_diffrn_reflns_theta_min         2.102
_exptl_absorpt_coefficient_mu    0.905
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6683
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1464 before and 0.0890 after correction. The Ratio of minimum to maximum transmission is 0.8966. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            'clear yellowish brown'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   yellowish
_exptl_crystal_colour_primary    brown
_exptl_crystal_density_diffrn    1.204
_exptl_crystal_description       block
_exptl_crystal_F_000             1851.978
_exptl_crystal_size_max          0.201
_exptl_crystal_size_mid          0.198
_exptl_crystal_size_min          0.094
_refine_diff_density_max         0.208
_refine_diff_density_min         -0.302
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details
;
 Flack x determined using 3486 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.006(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.746
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     546
_refine_ls_number_reflns         9812
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.746
_refine_ls_R_factor_all          0.0399
_refine_ls_R_factor_gt           0.0309
_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^)+(0.1000P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0887
_refine_ls_wR_factor_ref         0.0990
_reflns_Friedel_coverage         0.808
_reflns_Friedel_fraction_full    0.999
_reflns_Friedel_fraction_max     0.997
_reflns_number_gt                8722
_reflns_number_total             9812
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0cc01575j2.cif
_cod_data_source_block           2
_cod_depositor_comments
'Adding full bibliography for 7126523--7126527.cif.'
_cod_database_code               7126523
_shelx_shelxl_version_number     2016/6
_shelx_res_checksum              93198