Pyridine-boryl radicals-mediated reductive homocoupling of para-quinone methides
Wang, Yan-Bo; Cui, Yan-Zhao; Li, He; Liu, Huiyi; Yuan, Hao-Qi; Zhou, Hao-Tian; Wang, Xiao-Sai; Organic & Biomolecular Chemistry  (2025) –; doi:10.1039/D6OB00078A

data_7161084
_publ_section_title
;
 Pyridine-boryl radical-mediated reductive homocoupling of
 <i>para</i>-quinone methides.
;
_journal_issue                   15
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              3295
_journal_page_last               3300
_journal_paper_doi               10.1039/d6ob00078a
_journal_volume                  24
_journal_year                    2026
_chemical_formula_moiety         'C21 H25 Cl2 O'
_chemical_formula_sum            'C21 H25 Cl2 O'
_chemical_formula_weight         364.31
_chemical_name_systematic        CYZ-285
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_date             2025-01-18
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2026-01-13 deposited with the CCDC.	2026-03-20 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 132.633(6)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   22.434(5)
_cell_length_b                   15.147(3)
_cell_length_c                   18.526(5)
_cell_measurement_reflns_used    3571
_cell_measurement_temperature    294
_cell_measurement_theta_max      25.997
_cell_measurement_theta_min      2.243
_cell_volume                     4631.5(19)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      294.0
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker D8 VENTURE PHOTON II'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1081
_diffrn_reflns_av_unetI/netI     0.0926
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            18072
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        24.998
_diffrn_reflns_theta_max         24.998
_diffrn_reflns_theta_min         1.825
_exptl_absorpt_coefficient_mu    0.284
_exptl_absorpt_correction_T_max  0.2627
_exptl_absorpt_correction_T_min  0.1594
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.045
_exptl_crystal_description       block
_exptl_crystal_F_000             1544
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.908
_refine_diff_density_min         -0.600
_refine_diff_density_rms         0.076
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.097
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     242
_refine_ls_number_reflns         4075
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.097
_refine_ls_R_factor_all          0.1270
_refine_ls_R_factor_gt           0.0877
_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^)+(0.1332P)^2^+2.4491P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2406
_refine_ls_wR_factor_ref         0.2672
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2480
_reflns_number_total             4075
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d6ob00078a2.cif
_cod_data_source_block           m15455_0m_sq
_cod_depositor_comments
'Adding full bibliography for 7161083--7161088.cif.'
_cod_original_cell_volume        4631.6(19)
_cod_database_code               7161084
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.967
_shelx_estimated_absorpt_t_min   0.951
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H) groups, All C(H,H,H) groups, All O(H) groups
2. Restrained distances
 H003-H00K
 2 with sigma of 0.02
3.a Ternary CH refined with riding coordinates:
 C00I(H00I)
3.b Aromatic/amide H refined with riding coordinates:
 C006(H006), C00C(H00C), C00E(H00E), C00F(H00F), C00G(H00G)
3.c Idealised Me refined as rotating group:
 C00L(H00L,H00M,H00N), C00M(H00O,H00P,H00Q), C00N(H00R,H00S,H00T), C00O(H00U,
 H00V,H00W)
3.d Idealised tetrahedral OH refined as rotating group:
 O003(H003)
;
_shelx_res_checksum              92201
_shelx_fab_checksum              93958
_platon_squeeze_void_probe_radius 1.20
_olex2_submission_special_instructions 'No special instructions were received'