Helicity as a Steric Force: Stabilization and Helicity-Dependent Reversion of Coloredo-Quinonoid Intermediates of Helical Chromenes
Jarugu Narasimha Moorthy; Susovan Mandal; Arindam Mukhopadhyay; Subhas Samanta; Journal of the American Chemical Society 135 (2013) 6872–6884; doi:10.1021/ja312027c

data_4119712
_publ_contact_author_address
;Departmet of chemistry
Indian Institute of Technology - Kanpur
Kanpur - 208 016
INDIA
;
_publ_contact_author_email       moorthy@iitk.ac.in
_publ_contact_author_fax         +915122597436
_publ_contact_author_name        'Prof. J. N. Moorthy'
_publ_contact_author_phone       +915122597438
_publ_section_title
;
 Helicity as a Steric Force: Stabilization and Helicity-Dependent
 Reversion of Coloredo-Quinonoid Intermediates of Helical Chromenes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              6872
_journal_page_last               6884
_journal_paper_doi               10.1021/ja312027c
_journal_volume                  135
_journal_year                    2013
_chemical_formula_moiety         'C36 H25 N O'
_chemical_formula_sum            'C36 H25 N O'
_chemical_formula_weight         487.57
_space_group_IT_number           14
_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                 93.732(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.9435(14)
_cell_length_b                   8.7154(10)
_cell_length_c                   23.517(3)
_cell_measurement_temperature    100(2)
_cell_volume                     2442.7(5)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'SHELXL 5.1, XP (Sheldrick, 1994)'
_computing_publication_material  SHELXS-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker SMART APEX'
_diffrn_measurement_method       'phi and omega 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  0.0424
_diffrn_reflns_av_sigmaI/netI    0.0519
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            12416
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.74
_exptl_absorpt_coefficient_mu    0.079
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.326
_exptl_crystal_description       cuboidal
_exptl_crystal_F_000             1024
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.487
_refine_diff_density_min         -0.540
_refine_diff_density_rms         0.061
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.943
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     343
_refine_ls_number_reflns         4298
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.943
_refine_ls_R_factor_all          0.0858
_refine_ls_R_factor_gt           0.0611
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1102P)^2^+1.4637P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1625
_refine_ls_wR_factor_ref         0.1850
_reflns_number_gt                3032
_reflns_number_total             4298
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja312027c_si_004.cif
_cod_data_source_block           3Me
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               4119712