Phosphine containing dendrimers for highly regioselective rhodium catalysed hydroformylation of alkenes: a positive 'dendritic effect'
Ropartz, Loïc; Haxton, Katherine J.; Foster, Douglas F.; Morris, Russell E.; Slawin, Alexandra M. Z.; Cole-Hamilton, David J.; Journal of the Chemical Society, Dalton Transactions  (2002) 4323–; doi:10.1039/b206597e

data_7011993
_publ_section_title
;
 Phosphine containing dendrimers for highly regioselective rhodium
 catalysed hydroformylation of alkenes: a positive 'dendritic effect'
;
_journal_issue                   23
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              4323
_journal_paper_doi               10.1039/b206597e
_journal_year                    2002
_chemical_formula_moiety         'C56 H56 P4 Si'
_chemical_formula_sum            'C56 H56 P4 Si'
_chemical_formula_weight         880.98
_space_group_IT_number           82
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'I -4'
_symmetry_space_group_name_H-M   'I -4'
_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            2
_cell_length_a                   20.4806(14)
_cell_length_b                   20.4806(14)
_cell_length_c                   5.7429(6)
_cell_measurement_reflns_used    85
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      168
_cell_measurement_theta_min      12
_cell_volume                     2408.9(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 0.9
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.1057
_diffrn_reflns_av_sigmaI/netI    0.1213
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            6048
_diffrn_reflns_theta_full        23.31
_diffrn_reflns_theta_max         23.31
_diffrn_reflns_theta_min         2.81
_exptl_absorpt_coefficient_mu    0.218
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.761556
_exptl_absorpt_correction_type   sadabs
_exptl_crystal_colour            colourles
_exptl_crystal_density_diffrn    1.215
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             932
_exptl_crystal_size_max          .18
_exptl_crystal_size_mid          .1
_exptl_crystal_size_min          .1
_refine_diff_density_max         0.162
_refine_diff_density_min         -0.172
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.01(13)
_refine_ls_extinction_coef       0.0006(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.821
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     139
_refine_ls_number_reflns         1725
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.821
_refine_ls_R_factor_all          0.0951
_refine_ls_R_factor_gt           0.0453
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0100P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0512
_refine_ls_wR_factor_ref         0.0599
_reflns_number_gt                1090
_reflns_number_total             1725
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b206597e.txt
_cod_data_source_block           1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Tetragonal' changed to 'tetragonal'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      I-4
_cod_database_code               7011993