Reactions of a Highly Crowded Cyclic Stannylene with Iodoalkanes, Enones, and Dienes. Inhibition of Nucleophilic Substitution at Tin(IV) Centers
Asadi, Ashrafolmolouk; Eaborn, Colin; Hill, Michael S.; Hitchcock, Peter B.; Meehan, Margaret M.; Smith, J. David; Organometallics 21 (2002) 2430–; doi:10.1021/om020106y

data_4089322
_publ_section_title
;
 Reactions of a Highly Crowded Cyclic Stannylene with Iodoalkanes, Enones,
 and Dienes. Inhibition of Nucleophilic Substitution at Tin(IV) Centers
;
_journal_issue                   12
_journal_name_full               Organometallics
_journal_page_first              2430
_journal_paper_doi               10.1021/om020106y
_journal_volume                  21
_journal_year                    2002
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C25 H60 O1 Si6 Sn1'
_chemical_formula_structural     'C25 H60 O SI6 SN'
_chemical_formula_sum            'C25 H60 O Si6 Sn'
_chemical_formula_weight         663.96
_chemical_name_common
'[Sn{C3H3O(C2H5)}{C(SiMe3)2SiMe2CH2CH2SiMe2C(SiMe3)2}]'
_space_group_IT_number           62
_space_group_name_Hall           '-P 2c 2n'
_space_group_name_H-M_alt        'P n a m'
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      62
_symmetry_space_group_name_H-M   'P n a m'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/cifdics/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.1
_audit_creation_date             2000-10-25T16:02:15-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.4200(4)
_cell_length_b                   13.7856(5)
_cell_length_c                   20.4785(5)
_cell_measurement_reflns_used    87175
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.028
_cell_measurement_theta_min      3.705
_cell_measurement_wavelength     0.71073
_cell_volume                     3506.27(19)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device       KappaCCD
_diffrn_measurement_method       CCD
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0808
_diffrn_reflns_av_unetI/netI     0.0492
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            15311
_diffrn_reflns_theta_full        25.01
_diffrn_reflns_theta_max         25.01
_diffrn_reflns_theta_min         3.71
_exptl_absorpt_coefficient_mu    0.95
_exptl_absorpt_correction_T_max  0.865
_exptl_absorpt_correction_T_min  0.693
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'[c.f. r.h. blessing, acta cryst. (1995), a51, 33-38]'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.258
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1408
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.2
_geom_special_details
;
 All esds (except the esd in the dihedral angle between two l.s. planes)
 are estimated using the full covariance matrix.  The cell esds are taken
 into account individually in the estimation of esds in distances, angles
 and torsion angles; correlations between esds in cell parameters are only
 used when they are defined by crystal symmetry.  An approximate (isotropic)
 treatment of cell esds is used for estimating esds involving l.s. planes.
;
_refine_diff_density_max         0.997
_refine_diff_density_min         -0.689
_refine_diff_density_rms         0.09
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.26
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     283
_refine_ls_number_reflns         3161
_refine_ls_number_restraints     255
_refine_ls_restrained_S_all      1.228
_refine_ls_R_factor_all          0.0591
_refine_ls_R_factor_gt           0.0558
_refine_ls_shift/su_max          0.01
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+17.0712P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.128
_refine_ls_wR_factor_ref         0.1296
_refine_special_details
;
 The molecule is disordered across the mirror plane in space group Pnam with
 Sn,O,C21,C22, and C23 on the plane. Chemically equivalent Si-C bond lengths 
 were constrained to be equal and DELU constraints were placed on thermal parameters.
 Attempts at refining an ordered structure in Pna2(1) resulted in a very high wR2
 value of 0.252 and high residual peaks indicative of disorder.

 Refinement of F^2^ against ALL reflections.  The weighted R-factor wR and
 goodness of fit S are based on F^2^, conventional R-factors R are based
 on F, with F set to zero for negative F^2^. The threshold expression of
 F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is
 not relevant to the choice of reflections for refinement.  R-factors based
 on F^2^ are statistically about twice as large as those based on F, and R-
 factors based on ALL data will be even larger.
;
_reflns_number_gt                2976
_reflns_number_total             3161
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om020106y.cif
_cod_data_source_block           oct3200
_cod_depositor_comments
;
 Corrected multiple issues that were introduced during the initial deposition
 process. Due to a CIF syntax error in the original file, several data blocks
 were incorrectly merged into a single data block. As a result, the deposited
 data block did not describe a real crystal structure. To correct this, multiple
 data items had to be replaced or removed altogether.

 Antanas Vaitkus,
 2020-01-27
;
_cod_original_sg_symbol_H-M      Pnam
_cod_database_code               4089322