The hamburger-shape photocatalyst: thioxanthone-based chiral [2.2]paracyclophane for enantioselective visible-light photocatalysis of 3-methylquinoxalin-2(1<i>H</i>)-one and styrenes.
Huo, Shou-Chih; Indurmuddam, Ranadheer Reddy; Hong, Bor-Cherng; Lu, Chuan-Fu; Chien, Su-Ying; Organic & biomolecular chemistry 21 (2023) 9330–9336; doi:10.1039/d3ob01580g

data_7159752
_publ_section_title
;
 The hamburger-shape photocatalyst: thioxanthone-based chiral
 [2.2]paracyclophane for enantioselective visible-light photocatalysis of
 3-methylquinoxalin-2(1<i>H</i>)-one and styrenes.
;
_journal_issue                   47
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              9330
_journal_page_last               9336
_journal_paper_doi               10.1039/d3ob01580g
_journal_volume                  21
_journal_year                    2023
_chemical_formula_sum            'C19 H18 O4'
_chemical_formula_weight         310.33
_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-2019/1
_audit_update_record
;
2023-07-10 deposited with the CCDC.	2023-11-21 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.8405(4)
_cell_length_b                   10.9929(6)
_cell_length_c                   17.4746(9)
_cell_measurement_reflns_used    3972
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      77.0600
_cell_measurement_theta_min      4.5810
_cell_volume                     1506.13(14)
_computing_cell_refinement       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_collection       'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_data_reduction        'CrysAlisPro 1.171.39.46 (Rigaku OD, 2018)'
_computing_structure_refinement  'SHELXL-2019/1 (Sheldrick, 2019)'
_diffrn_ambient_temperature      200(2)
_diffrn_detector_area_resol_mean 10.2496
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Xcalibur, Atlas, Gemini'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0808
_diffrn_reflns_av_unetI/netI     0.0636
_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       -9
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            7840
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         67.999
_diffrn_reflns_theta_min         4.752
_diffrn_source                   'fine-focus sealed X-ray tube'
_exptl_absorpt_coefficient_mu    0.780
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.75600
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
CrysAlisPro 1.171.39.46 (Rigaku Oxford Diffraction, 2018) 
Empirical absorption correction using spherical harmonics, 
 implemented in SCALE3 ABSPACK scaling algorithm. 
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.369
_exptl_crystal_description       prism
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.286
_exptl_crystal_size_mid          0.283
_exptl_crystal_size_min          0.149
_refine_diff_density_max         0.387
_refine_diff_density_min         -0.276
_refine_diff_density_rms         0.061
_refine_ls_abs_structure_details
; 
 Flack x determined using 812 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   -0.4(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     209
_refine_ls_number_reflns         2741
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0757
_refine_ls_R_factor_gt           0.0674
_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^)+(0.1272P)^2^+0.0460P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1791
_refine_ls_wR_factor_ref         0.1917
_reflns_Friedel_coverage         0.718
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                2362
_reflns_number_total             2741
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d3ob01580g2.cif
_cod_data_source_block           ic21559
_cod_database_code               7159752
_shelx_shelxl_version_number     2019/1
_shelx_estimated_absorpt_t_min   0.808
_shelx_estimated_absorpt_t_max   0.893
_shelx_res_checksum              2888