General silaindene synthesis based on intramolecular reductive cyclization toward new fluorescent silicon-containing pi-electron materials.
Xu, Caihong; Wakamiya, Atsushi; Yamaguchi, Shigehiro; Organic letters 6 (2004) 3707–3710; doi:10.1021/ol0486932

data_1507023
_publ_section_title
;
 General silaindene synthesis based on intramolecular reductive
 cyclization toward new fluorescent silicon-containing pi-electron
 materials.
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              3707
_journal_page_last               3710
_journal_paper_doi               10.1021/ol0486932
_journal_volume                  6
_journal_year                    2004
_chemical_formula_sum            'C26 H26 Si2'
_chemical_formula_weight         394.65
_space_group_IT_number           61
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.750(4)
_cell_length_b                   16.542(10)
_cell_length_c                   20.635(12)
_cell_measurement_temperature    173(2)
_cell_volume                     2304(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.0407
_diffrn_reflns_av_sigmaI/netI    0.0268
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            16155
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.16
_exptl_absorpt_coefficient_mu    0.162
_exptl_absorpt_correction_T_max  0.9683
_exptl_absorpt_correction_T_min  0.9683
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.138
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.638
_refine_diff_density_min         -0.315
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.129
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     127
_refine_ls_number_reflns         2622
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.129
_refine_ls_R_factor_all          0.0638
_refine_ls_R_factor_gt           0.0574
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0934P)^2^+0.8589P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1533
_refine_ls_wR_factor_ref         0.1597
_reflns_number_gt                2351
_reflns_number_total             2622
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0486932si20040709_025529.cif
_cod_data_source_block           compound_7
_cod_database_code               1507023