Nucleophilic Addition to Silyl-Protected Five-Membered Ring Oxocarbenium Ions Governed by Stereoelectronic Effects
Vi Tuong Tran; K. A. Woerpel; Journal of Organic Chemistry 78 (2013) 6609–6621; doi:10.1021/jo400945j

data_4028406
_publ_section_title
;
 Nucleophilic Addition to Silyl-Protected Five-Membered Ring Oxocarbenium
 Ions Governed by Stereoelectronic Effects
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              6609
_journal_page_last               6621
_journal_paper_doi               10.1021/jo400945j
_journal_volume                  78
_journal_year                    2013
_chemical_formula_sum            'C26 H46 N4 O7 Si2'
_chemical_formula_weight         582.85
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 100.0940(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   24.0157(13)
_cell_length_b                   8.1309(4)
_cell_length_c                   16.5638(9)
_cell_measurement_reflns_used    9824
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.18
_cell_measurement_theta_min      2.58
_cell_volume                     3184.3(3)
_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      100(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  0.0295
_diffrn_reflns_av_sigmaI/netI    0.0170
_diffrn_reflns_limit_h_max       31
_diffrn_reflns_limit_h_min       -31
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            64142
_diffrn_reflns_theta_full        28.29
_diffrn_reflns_theta_max         28.29
_diffrn_reflns_theta_min         1.72
_exptl_absorpt_coefficient_mu    0.157
_exptl_absorpt_correction_T_max  0.9632
_exptl_absorpt_correction_T_min  0.9226
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.216
_exptl_crystal_description       block
_exptl_crystal_F_000             1256
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.423
_refine_diff_density_min         -0.243
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.067
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     406
_refine_ls_number_reflns         7864
_refine_ls_number_restraints     40
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0511
_refine_ls_R_factor_gt           0.0436
_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^)+(0.0509P)^2^+1.8094P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1115
_refine_ls_wR_factor_ref         0.1167
_reflns_number_gt                6808
_reflns_number_total             7864
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo400945j_si_003.cif
_cod_data_source_block           12kaw11h
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4028406