Light-Induced Enantiospecific 4π Ring Closure of Axially Chiral 2-Pyridones: Enthalpic and Entropic Effects Promoted by H-Bonding
Elango Kumarasamy; Josepha L. Jesuraj; Joseph N. Omlid; Angel Ugrinov; Jayaraman Sivaguru; Journal of the American Chemical Society 133 (2011) 17106–17109; doi:10.1021/ja203087a

data_4107018
_publ_contact_author_name        'Jayaraman Sivaguru'
_publ_contact_author_phone       '701 231-8923'
_publ_section_title
;
 Light-Induced Enantiospecific 4\p Ring Closure of Axially Chiral
 2-Pyridones: Enthalpic and Entropic Effects Promoted by H-Bonding
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              17106
_journal_page_last               17109
_journal_paper_doi               10.1021/ja203087a
_journal_volume                  133
_journal_year                    2011
_chemical_formula_moiety         'C24 H19 N O2'
_chemical_formula_sum            'C24 H19 N O2'
_chemical_formula_weight         353.40
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 114.990(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.601(10)
_cell_length_b                   6.388(4)
_cell_length_c                   18.243(10)
_cell_measurement_reflns_used    3237
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      24.24
_cell_measurement_theta_min      2.46
_cell_volume                     1859.1(19)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0557
_diffrn_reflns_av_sigmaI/netI    0.0504
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            13835
_diffrn_reflns_theta_full        25.22
_diffrn_reflns_theta_max         25.22
_diffrn_reflns_theta_min         1.35
_exptl_absorpt_coefficient_mu    0.080
_exptl_absorpt_correction_T_max  .7452
_exptl_absorpt_correction_T_min  .6475
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Acta Cryst (1995). A51, 33-38'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.263
_exptl_crystal_description       rod
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.292
_refine_diff_density_min         -0.257
_refine_diff_density_rms         0.077
_refine_ls_extinction_coef       0.034(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     246
_refine_ls_number_reflns         3349
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.042
_refine_ls_R_factor_all          0.0900
_refine_ls_R_factor_gt           0.0468
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0739P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1082
_refine_ls_wR_factor_ref         0.1368
_reflns_number_gt                2142
_reflns_number_total             3349
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja203087a_si_002_6.cif
_cod_data_source_block           1c
_cod_original_cell_volume        1859.1(18)
_cod_database_code               4107018