Fraternal twins: B2O2- or B2N2-doped polycyclic π systems and their formation mechanism via regiodivergent Au-versus amine catalyzed cycloadditions
Mittag, Simon M.; Klopf, Jonas; Virovets, Alexander; Peresypkina, Eugenia V.; Lerner, Hans-Wolfram; Helten, Holger; Wagner, Matthias; Dalton Transactions  (2026) –; doi:10.1039/D6DT00412A

data_7720376
_publ_section_title
;
 Fraternal twins: B<sub>2</sub>O<sub>2</sub>- or
 B<sub>2</sub>N<sub>2</sub>-doped polycyclic &#x3c0; systems and their
 formation mechanism <i>via</i> regiodivergent Au- <i>versus</i>
 amine-catalyzed cyclizations.
;
_journal_issue                   14
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              5553
_journal_page_last               5564
_journal_paper_doi               10.1039/d6dt00412a
_journal_volume                  55
_journal_year                    2026
_chemical_formula_sum            'C23 H25 B O'
_chemical_formula_weight         328.24
_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     dual
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2019/3
_audit_update_record
;
2026-01-15 deposited with the CCDC.	2026-02-27 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90.167(13)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   22.4572(18)
_cell_length_b                   11.5161(13)
_cell_length_c                   15.2101(12)
_cell_measurement_reflns_used    4445
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.5000
_cell_measurement_theta_min      1.8890
_cell_volume                     3933.6(6)
_computing_cell_refinement       'CrysAlisPro 1.171.42.43a (Rigaku OD, 2022)'
_computing_data_collection       'P24 beamline local software'
_computing_data_reduction        'CrysAlisPro 1.171.42.43a (Rigaku OD, 2022)'
_computing_publication_material  'IUCr PublCIF online service'
_computing_structure_refinement  'SHELXL-2019/2 (Sheldrick, 2019)'
_computing_structure_solution    'SHELXT (G. M. Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector
'X-Spectrum Lambda 7.5M CdTe photon-counting detector'
_diffrn_detector_area_resol_mean 18.2
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device
'DESY Petra3 P24 beamline, Huber diffractometer, Lambda 7.5M CdTe'
_diffrn_measurement_method       '\f scans'
_diffrn_radiation_monochromator  synchrotron
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.56000
_diffrn_reflns_av_R_equivalents  0.0712
_diffrn_reflns_av_sigmaI/netI    0.0705
_diffrn_reflns_Laue_measured_fraction_full 0.985
_diffrn_reflns_Laue_measured_fraction_max 0.981
_diffrn_reflns_limit_h_max       29
_diffrn_reflns_limit_h_min       -29
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            17985
_diffrn_reflns_point_group_measured_fraction_full 0.985
_diffrn_reflns_point_group_measured_fraction_max 0.981
_diffrn_reflns_theta_full        19.633
_diffrn_reflns_theta_max         21.617
_diffrn_reflns_theta_min         1.887
_exptl_absorpt_coefficient_mu    0.043
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.90660
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.43.144a (Rigaku Oxford Diffraction, 2024)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.108
_exptl_crystal_description       plate
_exptl_crystal_F_000             1408
_exptl_crystal_size_max          0.210
_exptl_crystal_size_mid          0.160
_exptl_crystal_size_min          0.080
_refine_diff_density_max         0.333
_refine_diff_density_min         -0.320
_refine_diff_density_rms         0.045
_refine_ls_extinction_coef       0.012(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2019/2 (Sheldrick 2019)'
_refine_ls_goodness_of_fit_ref   1.075
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     507
_refine_ls_number_reflns         17985
_refine_ls_number_restraints     72
_refine_ls_restrained_S_all      1.111
_refine_ls_R_factor_all          0.0655
_refine_ls_R_factor_gt           0.0538
_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^)+(0.0779P)^2^+0.8580P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1462
_refine_ls_wR_factor_ref         0.1513
_reflns_Friedel_coverage         0.000
_reflns_number_gt                14352
_reflns_number_total             17985
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d6dt00412a2.cif
_cod_data_source_block           BOSI_SM320-202_P24
_cod_depositor_comments
'Adding full bibliography for 7720366--7720383.cif.'
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7720376
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_min   0.991
_shelx_estimated_absorpt_t_max   0.997
_oxdiff_exptl_absorpt_empirical_full_min 0.878
_oxdiff_exptl_absorpt_empirical_full_max 1.159
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_shelx_res_checksum              608