Synthesis, Structure, and Chemistry of New, Mixed Group 14 and 16 Heterocycles: Nucleophile-Induced Ring Contraction of Mesocyclic Dications
Eric Block; Evgeny V. Dikarev; Richard S. Glass; Jin Jin; Bo Li; Xiaojie Li; Shao-Zhong Zhang; Journal of the American Chemical Society 128 (2006) 14949–14961; doi:10.1021/ja065037j

data_4111084
_publ_section_title
;
 Synthesis, Structure, and Chemistry of New, Mixed Group 14 and 16
 Heterocycles: Nucleophile-Induced Ring Contraction of Mesocyclic
 Dications
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14949
_journal_page_last               14961
_journal_paper_doi               10.1021/ja065037j
_journal_volume                  128
_journal_year                    2006
_chemical_formula_moiety         'Se2 (C H2)4 (Si (C H3)2)4'
_chemical_formula_sum            'C12 H32 Se2 Si4'
_chemical_formula_weight         446.66
_chemical_name_systematic
; 
 3,3,4,4,8,8,9,9-Octamethyl-1,6-diselena-3,4,8,9-tetrasilacyclodecane    
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                103.8910(10)
_cell_angle_beta                 94.1820(10)
_cell_angle_gamma                107.2310(10)
_cell_formula_units_Z            1
_cell_length_a                   6.2293(4)
_cell_length_b                   8.0571(5)
_cell_length_c                   11.4887(7)
_cell_measurement_reflns_used    3914
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.21
_cell_measurement_theta_min      2.75
_cell_volume                     528.14(6)
_computing_cell_refinement       'SMART, SAINT'
_computing_data_collection       SMART
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXP-93 (Sheldrick, 1993)'
_computing_publication_material  'SHELXCIF-93 (Sheldrick, 1993)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.907
_diffrn_measured_fraction_theta_max 0.907
_diffrn_measurement_device_type  'Bruker SMART APEX CCD'
_diffrn_measurement_method       '0.3 deg wide \w exposures'
_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  0.0113
_diffrn_reflns_av_sigmaI/netI    0.0182
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            4677
_diffrn_reflns_theta_full        28.22
_diffrn_reflns_theta_max         28.22
_diffrn_reflns_theta_min         1.85
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count na
_diffrn_standards_interval_time  na
_diffrn_standards_number         'none (area detector data)'
_exptl_absorpt_coefficient_mu    3.715
_exptl_absorpt_correction_T_max  0.8079
_exptl_absorpt_correction_T_min  0.5545
_exptl_absorpt_correction_type   'multi-scan (SADABS)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.404
_exptl_crystal_density_method    none
_exptl_crystal_description       block
_exptl_crystal_F_000             228
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.267
_refine_diff_density_min         -0.289
_refine_diff_density_rms         0.072
_refine_ls_extinction_coef       noref
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.088
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     146
_refine_ls_number_reflns         2371
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.088
_refine_ls_R_factor_all          0.0193
_refine_ls_R_factor_gt           0.0182
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0332P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0497
_refine_ls_wR_factor_ref         0.0504
_reflns_number_gt                2256
_reflns_number_total             2371
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja065037jsi20060721_015610.cif
_cod_data_source_block           C12H32Se2Si4_42
_cod_database_code               4111084