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_4036956
_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 H31 N O3'
_chemical_formula_sum            'C23 H31 N O3'
_chemical_formula_weight         369.49
_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            8
_cell_length_a                   6.2306(2)
_cell_length_b                   15.6867(5)
_cell_length_c                   41.3174(13)
_cell_measurement_reflns_used    9976
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      66.582
_cell_measurement_theta_min      4.272
_cell_volume                     4038.3(2)
_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      100.01
_diffrn_measured_fraction_theta_full 0.982
_diffrn_measured_fraction_theta_max 0.982
_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  0.0199
_diffrn_reflns_av_unetI/netI     0.0217
_diffrn_reflns_Laue_measured_fraction_full 0.982
_diffrn_reflns_Laue_measured_fraction_max 0.982
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       48
_diffrn_reflns_limit_l_min       -40
_diffrn_reflns_number            16255
_diffrn_reflns_point_group_measured_fraction_full 0.902
_diffrn_reflns_point_group_measured_fraction_max 0.902
_diffrn_reflns_theta_full        66.581
_diffrn_reflns_theta_max         66.581
_diffrn_reflns_theta_min         3.538
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.629
_exptl_absorpt_correction_T_max  0.7528
_exptl_absorpt_correction_T_min  0.6781
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2012/1 (Bruker,2012) was used for absorption correction.
wR2(int) was 0.0635 before and 0.0327 after correction.
The Ratio of minimum to maximum transmission is 0.9008.
The \l/2 correction factor is 0.0015.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.215
_exptl_crystal_description       plate
_exptl_crystal_F_000             1600
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.136
_refine_diff_density_min         -0.176
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details
;
 Flack x determined using 2300 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.04(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.045
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     497
_refine_ls_number_reflns         6440
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0276
_refine_ls_R_factor_gt           0.0265
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0354P)^2^+0.7467P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0656
_refine_ls_wR_factor_ref         0.0663
_reflns_Friedel_coverage         0.595
_reflns_Friedel_fraction_full    0.793
_reflns_Friedel_fraction_max     0.792
_reflns_number_gt                6238
_reflns_number_total             6440
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo6b01066_si_002.cif
_cod_data_source_block           cc_1S_6R_12R_aP-2b
_cod_database_code               4036956
_shelx_estimated_absorpt_t_max   0.969
_shelx_estimated_absorpt_t_min   0.859
_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:
 C12A(H12A), C6A(H6A), C12B(H12B), C6B(H6B)
2.b Secondary CH2 refined with riding coordinates:
 C9A(H9AA,H9AB), C10A(H10A,H10B), C11A(H11A,H11B), C13A(H13A,H13B), C4A(H4AA,
 H4AB), C9B(H9BA,H9BB), C10B(H10C,H10D), C11B(H11C,H11D), C13B(H13C,H13D),
 C4B(H4BA,H4BB)
2.c Aromatic/amide H refined with riding coordinates:
 C20A(H20A), C19A(H19A), C18A(H18A), C17A(H17A), C19B(H19B), C18B(H18B),
 C20B(H20B), C21B(H21B)
2.d Idealised Me refined as rotating group:
 C23A(H23A,H23B,H23C), C26A(H26A,H26B,H26C), C14A(H14A,H14B,H14C), C25A(H25A,
 H25B,H25C), C24A(H24A,H24B,H24C), C26B(H26D,H26E,H26F), C14B(H14D,H14E,H14F),
 C23B(H23D,H23E,H23F), C24B(H24D,H24E,H24F), C25B(H25D,H25E,H25F)
;
_shelx_res_checksum              87300
_shelx_hkl_checksum              48435
_shelx_shelxl_version_number     2014/7
_olex2_submission_special_instructions 'No special instructions were received'