Orbital Interactions in Selenomethyl-Substituted Pyridinium Ions and Carbenium Ions with Higher Electron Demand
S. Fern Lim; Benjamin L. Harris; Paul Blanc; Jonathan M. White; Journal of Organic Chemistry 76 (2011) 1673–1682; doi:10.1021/jo102307v

data_4026115
_publ_section_title
;
 Orbital Interactions in Selenomethyl-Substituted Pyridinium Ions and
 Carbenium Ions with Higher Electron Demand
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              1673
_journal_page_last               1682
_journal_paper_doi               10.1021/jo102307v
_journal_volume                  76
_journal_year                    2011
_chemical_formula_sum            'C18 H25 N O3 S Se'
_chemical_formula_weight         414.41
_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                 90.467(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.4160(3)
_cell_length_b                   9.5355(2)
_cell_length_c                   11.4018(2)
_cell_measurement_reflns_used    3320
_cell_measurement_temperature    130(2)
_cell_measurement_theta_max      73.1738
_cell_measurement_theta_min      4.6069
_cell_volume                     1893.44(6)
_computing_cell_refinement
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
;
_computing_data_collection
;
CrysAlis CCD, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
;
_computing_data_reduction
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      130(2)
_diffrn_measured_fraction_theta_full 0.949
_diffrn_measured_fraction_theta_max 0.949
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0358
_diffrn_reflns_av_sigmaI/netI    0.0474
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            8219
_diffrn_reflns_theta_full        74.83
_diffrn_reflns_theta_max         74.83
_diffrn_reflns_theta_min         5.08
_exptl_absorpt_coefficient_mu    3.843
_exptl_absorpt_correction_T_max  0.887
_exptl_absorpt_correction_T_min  0.359
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
numerical absorption correction based on gaussian integration over
            a multifaceted crystal model
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.454
_exptl_crystal_description       plate
_exptl_crystal_F_000             856
_exptl_crystal_size_max          0.4099
_exptl_crystal_size_mid          0.2556
_exptl_crystal_size_min          0.0300
_refine_diff_density_max         0.707
_refine_diff_density_min         -0.273
_refine_diff_density_rms         0.078
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.941
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         3690
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.941
_refine_ls_R_factor_all          0.0551
_refine_ls_R_factor_gt           0.0400
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0549P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0920
_refine_ls_wR_factor_ref         0.0964
_reflns_number_gt                2821
_reflns_number_total             3690
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo102307v_si_004.cif
_cod_data_source_block           jmwsf14
_cod_database_code               4026115