Metal-Free Visible Light-Mediated Photocatalysis: Controlling Intramolecular [2 + 2] Photocycloaddition of Enones through Axial Chirality.
Clay, Anthony; Vallavoju, Nandini; Krishnan, Retheesh; Ugrinov, Angel; Sivaguru, Jayaraman; The Journal of organic chemistry 81 (2016) 7191–7200; doi:10.1021/acs.joc.6b01066

data_4036955
_publ_section_title
;
 Metal-Free Visible Light-Mediated Photocatalysis: Controlling
 Intramolecular [2 + 2] Photocycloaddition of Enones through Axial
 Chirality.
;
_journal_issue                   16
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              7191
_journal_page_last               7200
_journal_paper_doi               10.1021/acs.joc.6b01066
_journal_volume                  81
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C23 H29 N O5'
_chemical_formula_sum            'C23 H29 N O5'
_chemical_formula_weight         399.47
_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
_atom_sites_solution_primary     direct
_audit_creation_date             2016-04-29
_audit_creation_method
;
Olex2 1.2
(compiled 2016.02.19 svn.r3266 for OlexSys, GUI svn.r5155)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.0354(6)
_cell_length_b                   13.7812(10)
_cell_length_c                   18.9887(14)
_cell_measurement_reflns_used    9977
_cell_measurement_temperature    101(2)
_cell_measurement_theta_max      66.609
_cell_measurement_theta_min      4.657
_cell_volume                     2102.8(3)
_computing_cell_refinement       'SAINT v8.34A (Bruker, 2013)'
_computing_data_reduction        'SAINT v8.34A (Bruker, 2013)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS (Sheldrick, 2008)'
_diffrn_ambient_temperature      100.96
_diffrn_measured_fraction_theta_full 0.985
_diffrn_measured_fraction_theta_max 0.985
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0252
_diffrn_reflns_av_unetI/netI     0.0238
_diffrn_reflns_Laue_measured_fraction_full 0.985
_diffrn_reflns_Laue_measured_fraction_max 0.985
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            12152
_diffrn_reflns_point_group_measured_fraction_full 0.947
_diffrn_reflns_point_group_measured_fraction_max 0.947
_diffrn_reflns_theta_full        66.604
_diffrn_reflns_theta_max         66.604
_diffrn_reflns_theta_min         4.657
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.719
_exptl_absorpt_correction_T_max  0.7528
_exptl_absorpt_correction_T_min  0.6886
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/2 (Bruker,2014/2) was used for absorption correction.
wR2(int) was 0.0832 before and 0.0448 after correction.
The Ratio of minimum to maximum transmission is 0.9147.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.262
_exptl_crystal_description       plate
_exptl_crystal_F_000             856
_exptl_crystal_size_max          0.225
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.085
_refine_diff_density_max         0.173
_refine_diff_density_min         -0.161
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details
;
 Flack x determined using 1369 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.06(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.070
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     269
_refine_ls_number_reflns         3521
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.070
_refine_ls_R_factor_all          0.0287
_refine_ls_R_factor_gt           0.0282
_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^)+(0.0349P)^2^+0.4899P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0708
_refine_ls_wR_factor_ref         0.0712
_reflns_Friedel_coverage         0.670
_reflns_Friedel_fraction_full    0.894
_reflns_Friedel_fraction_max     0.894
_reflns_number_gt                3452
_reflns_number_total             3521
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo6b01066_si_002.cif
_cod_data_source_block           cc_1R_6R_10R_aP-2e
_cod_database_code               4036955
_shelx_estimated_absorpt_t_max   0.941
_shelx_estimated_absorpt_t_min   0.855
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C6(H6)
2.b Secondary CH2 refined with riding coordinates:
 C4(H4A,H4B), C11(H11A,H11B)
2.c Aromatic/amide H refined with riding coordinates:
 C19(H19), C18(H18), C21(H21)
2.d Idealised Me refined as rotating group:
 C28(H28A,H28B,H28C), C12(H12A,H12B,H12C), C24(H24A,H24B,H24C), C25(H25A,H25B,
 H25C), C26(H26A,H26B,H26C), C29(H29A,H29B,H29C), C13(H13A,H13B,H13C)
;
_shelx_res_checksum              48999
_shelx_hkl_checksum              99582
_shelx_shelxl_version_number     2014/7
_olex2_submission_special_instructions 'No special instructions were received'