The 2,4,6-Trimethoxyphenyl Unit as a Unique Protecting Group for Silicon in Synthesis and the Silylation Potential of (2,4,6-Trimethoxyphenyl)silanes
Popp, Friedrich; Nätscher, Jennifer B.; Daiss, Jürgen O.; Burschka, Christian; Tacke, Reinhold; Organometallics 26 (2007) 6014–; doi:10.1021/om700805p

data_4074002
_publ_section_title
;
 The 2,4,6-Trimethoxyphenyl Unit as a Unique Protecting Group for Silicon
 in Synthesis and the Silylation Potential of
 (2,4,6-Trimethoxyphenyl)silanes
;
_journal_issue                   24
_journal_name_full               Organometallics
_journal_page_first              6014
_journal_paper_doi               10.1021/om700805p
_journal_volume                  26
_journal_year                    2007
_chemical_formula_moiety         'C28 H28 Si'
_chemical_formula_sum            'C28 H28 Si'
_chemical_formula_weight         392.59
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                82.83(3)
_cell_angle_beta                 78.30(3)
_cell_angle_gamma                89.25(3)
_cell_formula_units_Z            2
_cell_length_a                   7.0858(14)
_cell_length_b                   9.863(2)
_cell_length_c                   16.141(3)
_cell_measurement_reflns_used    5000
_cell_measurement_temperature    183(2)
_cell_measurement_theta_max      25.35
_cell_measurement_theta_min      5.1
_cell_volume                     1095.9(4)
_computing_cell_refinement       Stoe-IPDS
_computing_data_collection       Stoe-IPDS
_computing_data_reduction        Stoe-IPDS
_computing_molecular_graphics    Ortep/Povray
_computing_publication_material  Bruker-SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      183(2)
_diffrn_measured_fraction_theta_full 0.913
_diffrn_measured_fraction_theta_max 0.913
_diffrn_measurement_device_type  Stoe_image_plate
_diffrn_measurement_method       omega_scan
_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  0.0305
_diffrn_reflns_av_sigmaI/netI    0.0272
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            14456
_diffrn_reflns_theta_full        28.13
_diffrn_reflns_theta_max         28.13
_diffrn_reflns_theta_min         2.59
_exptl_absorpt_coefficient_mu    0.119
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.190
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             420
_exptl_crystal_size_max          .5
_exptl_crystal_size_mid          .3
_exptl_crystal_size_min          .2
_refine_diff_density_max         0.344
_refine_diff_density_min         -0.160
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     265
_refine_ls_number_reflns         4890
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.0504
_refine_ls_R_factor_gt           0.0399
_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^)+(0.0639P)^2^+0.2103P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1040
_refine_ls_wR_factor_ref         0.1102
_reflns_number_gt                4055
_reflns_number_total             4890
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om700805p-file006.cif
_cod_data_source_block           pop08h
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4074002