Visible-Light-Induced Dearomatization via [2+2] Cycloaddition or 1,5-Hydrogen Atom Transfer: Divergent Reaction Pathways of Transient Diradicals
Zhu, Min; Zhang, Xiao; Zheng, Chao; You, Shu-Li; ACS Catalysis  (2020) 12618–12626; doi:10.1021/acscatal.0c03808

data_4518143
_publ_section_title
;
 Visible-Light-Induced Dearomatization via [2+2] Cycloaddition or
 1,5-Hydrogen Atom Transfer: Divergent Reaction Pathways of Transient
 Diradicals
;
_journal_name_full               'ACS Catalysis'
_journal_page_first              12618
_journal_page_last               12626
_journal_paper_doi               10.1021/acscatal.0c03808
_journal_year                    2020
_chemical_formula_sum            'C20 H20 N2 O2'
_chemical_formula_weight         320.38
_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   mixed
_audit_creation_method           SHELXL-2013
_cell_angle_alpha                90
_cell_angle_beta                 104.566(7)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.058(3)
_cell_length_b                   9.432(2)
_cell_length_c                   14.999(4)
_cell_measurement_reflns_used    4127
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      47.133
_cell_measurement_theta_min      5.651
_cell_volume                     1651.0(7)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.999
_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  0.0894
_diffrn_reflns_av_unetI/netI     0.0609
_diffrn_reflns_Laue_measured_fraction_full 0.974
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            19111
_diffrn_reflns_point_group_measured_fraction_full 0.974
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         24.999
_diffrn_reflns_theta_min         2.575
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6356
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.289
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.170
_exptl_crystal_size_mid          0.140
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.158
_refine_diff_density_min         -0.188
_refine_diff_density_rms         0.043
_refine_ls_extinction_coef       0.011(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     231
_refine_ls_number_reflns         2899
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.1217
_refine_ls_R_factor_gt           0.0644
_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^)+(0.0642P)^2^+0.8015P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1388
_refine_ls_wR_factor_ref         0.1707
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1723
_reflns_number_total             2899
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            cs0c03808_si_003.cif
_cod_data_source_block           mo_d8v20001_0m
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4518143
_shelx_estimated_absorpt_t_min   0.986
_shelx_estimated_absorpt_t_max   0.992
_shelxl_version_number           2013-4
_shelx_res_checksum              49592
_shelx_hkl_checksum              84435