Solid-state [2+2] photodimerization of eniminium salts: stereoselective syntheses of 1,3-diacetylcyclobutanes.
Yamada, Shinji; Honda, Yuka; Chemical communications (Cambridge, England) 60 (2024) 9821–9824; doi:10.1039/d4cc03691c

data_7133489
_publ_section_title
;
 Solid-state [2+2] photodimerization of eniminium salts: stereoselective
 syntheses of 1,3-diacetylcyclobutanes.
;
_journal_issue                   72
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              9821
_journal_page_last               9824
_journal_paper_doi               10.1039/d4cc03691c
_journal_volume                  60
_journal_year                    2024
_chemical_formula_moiety         'C15 H20 B F4 N'
_chemical_formula_sum            'C15 H20 B F4 N'
_chemical_formula_weight         301.13
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_block_doi                 10.5517/ccdc.csd.cc2kl07f
_audit_update_record
;
2024-07-14 deposited with the CCDC.	2024-08-12 downloaded from the CCDC.
;
_cell_angle_alpha                90.0000
_cell_angle_beta                 95.164(2)
_cell_angle_gamma                90.0000
_cell_formula_units_Z            4
_cell_length_a                   7.5602(3)
_cell_length_b                   15.2074(5)
_cell_length_c                   12.6685(5)
_cell_measurement_reflns_used    5031
_cell_measurement_temperature    123
_cell_measurement_theta_max      68.06
_cell_measurement_theta_min      3.50
_cell_volume                     1450.60(9)
_computing_cell_refinement       'RAPID AUTO'
_computing_data_collection       'RAPID AUTO (Rigaku, ????)'
_computing_data_reduction        'RAPID AUTO'
_computing_molecular_graphics    'CrystalStructure 4.2.1'
_computing_publication_material  'CrystalStructure 4.2.1 (Rigaku, 2016)'
_computing_structure_refinement  'SHELXL Version 2014/7 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXT Version 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      123
_diffrn_detector_area_resol_mean 10.000
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Rigaku R-AXIS RAPID'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54187
_diffrn_reflns_av_R_equivalents  0.0578
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            16580
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        67.687
_diffrn_reflns_theta_max         68.245
_diffrn_reflns_theta_min         4.554
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.985
_exptl_absorpt_correction_T_max  0.952
_exptl_absorpt_correction_T_min  0.809
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'ABSCOR (Rigaku, 1995)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.379
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       unknown
_exptl_crystal_F_000             632.00
_exptl_crystal_size_max          0.250
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.38
_refine_diff_density_min         -0.34
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.198
_refine_ls_hydrogen_treatment    constr
_refine_ls_number_parameters     192
_refine_ls_number_reflns         2641
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0998
_refine_ls_R_factor_gt           0.0734
_refine_ls_shift/su_max          0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.1448P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2250
_refine_ls_wR_factor_ref         0.2621
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1678
_reflns_number_total             2641
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            d4cc03691c2.cif
_cod_data_source_block           2-Me-PYRROIMINIUM-BF4-1
_cod_depositor_comments
'Adding full bibliography for 7133484--7133496.cif.'
_cod_database_code               7133489
_shelx_res_checksum              61255
_shelx_hkl_checksum              17007