Bioinspired Polyene Cyclization Promoted by Intermolecular Chiral Acetal-SnCl4 or Chiral N-Acetal-TiCl4: Investigation of the Mechanism and Identification of the Key Intermediates
Yu-Jun Zhao; Teck-Peng Loh; Journal of the American Chemical Society 130 (2008) 10024–10029; doi:10.1021/ja802896n

data_4108123
_publ_section_title
;
 Bioinspired Polyene Cyclization Promoted by Intermolecular Chiral
 Acetal-SnCl4 or Chiral N-Acetal-TiCl4: Investigation of the Mechanism and
 Identification of the Key Intermediates
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10024
_journal_page_last               10029
_journal_paper_doi               10.1021/ja802896n
_journal_volume                  130
_journal_year                    2008
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C22 H21 N O3 S'
_chemical_formula_sum            'C22 H21 N O3 S'
_chemical_formula_weight         379.46
_space_group_IT_number           1
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  'P 1'
_symmetry_space_group_name_H-M   'P 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                82.344(2)
_cell_angle_beta                 70.2650(10)
_cell_angle_gamma                61.284(2)
_cell_formula_units_Z            2
_cell_length_a                   10.1814(3)
_cell_length_b                   10.5773(4)
_cell_length_c                   10.8061(3)
_cell_measurement_reflns_used    5682
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      30.16
_cell_measurement_theta_min      2.38
_cell_volume                     960.06(6)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'CCD area detector'
_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  0.0351
_diffrn_reflns_av_sigmaI/netI    0.0546
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            24120
_diffrn_reflns_theta_full        30.64
_diffrn_reflns_theta_max         30.64
_diffrn_reflns_theta_min         2.00
_exptl_absorpt_coefficient_mu    0.191
_exptl_absorpt_correction_T_max  0.9756
_exptl_absorpt_correction_T_min  0.9450
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.313
_exptl_crystal_density_meas      0
_exptl_crystal_description       plate
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.296
_refine_diff_density_min         -0.429
_refine_diff_density_rms         0.057
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.07(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     530
_refine_ls_number_reflns         10716
_refine_ls_number_restraints     172
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.0507
_refine_ls_R_factor_gt           0.0401
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0341P)^2^+0.2206P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0857
_refine_ls_wR_factor_ref         0.0987
_reflns_number_gt                9197
_reflns_number_total             10716
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja802896n-file006.cif
_cod_data_source_block           ltp69
_cod_original_cell_volume        960.06(5)
_cod_database_code               4108123