[2+2]-Photocycloaddition of N-Benzylmaleimide to Alkenes As an Approach to Functional 3-Azabicyclo[3.2.0]heptanes.
Skalenko, Yevhen A.; Druzhenko, Tetiana V.; Denisenko, Aleksandr V.; Samoilenko, Maryna V.; Dacenko, Oleksandr P.; Trofymchuk, Serhii A.; Grygorenko, Oleksandr O.; Tolmachev, Andrey A.; Mykhailiuk, Pavel K.; The Journal of organic chemistry 83 (2018) 6275–6289; doi:10.1021/acs.joc.8b00077

data_4035848
_publ_section_title
;
 [2+2]-Photocycloaddition of N-Benzylmaleimide to Alkenes As an Approach
 to Functional 3-Azabicyclo[3.2.0]heptanes.
;
_journal_issue                   12
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              6275
_journal_page_last               6289
_journal_paper_doi               10.1021/acs.joc.8b00077
_journal_volume                  83
_journal_year                    2018
_chemical_formula_sum            'C14 H14 Br N O2'
_chemical_formula_weight         308.17
_space_group_crystal_system      monoclinic
_space_group_IT_number           9
_space_group_name_Hall           'C -2yc'
_space_group_name_H-M_alt        'C 1 c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 104.343(19)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.3634(16)
_cell_length_b                   17.543(7)
_cell_length_c                   12.5068(18)
_cell_measurement_reflns_used    451
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      18.0
_cell_measurement_theta_min      3.5
_cell_volume                     1352.7(7)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 16.1827
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Xcalibur, Sapphire3'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0821
_diffrn_reflns_av_unetI/netI     0.1264
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            4498
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        24.989
_diffrn_reflns_theta_max         24.989
_diffrn_reflns_theta_min         3.363
_diffrn_source                   'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    3.032
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.043
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.32 (release 02-08-2013 CrysAlis171 .NET)
(compiled Aug  2 2013,16:46:58)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.513
_exptl_crystal_description       plate
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.150
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.296
_refine_diff_density_min         -0.336
_refine_diff_density_rms         0.064
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.12(3)
_refine_ls_extinction_coef       0.0011(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   0.887
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     165
_refine_ls_number_reflns         2129
_refine_ls_number_restraints     55
_refine_ls_restrained_S_all      0.886
_refine_ls_R_factor_all          0.1353
_refine_ls_R_factor_gt           0.0568
_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^)+(0.0357P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1046
_refine_ls_wR_factor_ref         0.1394
_reflns_Friedel_coverage         0.992
_reflns_Friedel_fraction_full    0.997
_reflns_Friedel_fraction_max     0.997
_reflns_number_gt                1024
_reflns_number_total             2129
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b00077_si_002.cif
_cod_data_source_block           6a
_cod_original_sg_symbol_H-M      'C c'
_cod_database_code               4035848
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.582
_shelx_estimated_absorpt_t_max   0.888
_shelx_hkl_checksum              33753