Platinum-catalysed 1,4-diboration of 1,3-dienes
Clegg, William; Johann, Thorsten R. F.; Marder, Todd B.; Norman, Nicholas C.; Orpen, A. Guy; Peakman, Torren M.; Quayle, Michael J.; Rice, Craig R.; Scott, Andrew J.; Journal of the Chemical Society, Dalton Transactions  (1998) 1431–; doi:10.1039/a800108a

data_7027837
_publ_section_title
;
 Platinum-catalysed 1,4-diboration of 1,3-dienes
;
_journal_issue                   9
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              1431
_journal_paper_doi               10.1039/a800108a
_journal_year                    1998
_chemical_formula_structural     '(B O2 C2 H2 Ph2) 2'
_chemical_formula_sum            'C28 H24 B2 O4'
_chemical_formula_weight         446.09
_chemical_name_systematic
; 
 bis(1,2-diphenylethane-1,2-diol)diboron 
;
_space_group_IT_number           92
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4abw 2nw'
_symmetry_space_group_name_H-M   'P 41 21 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.731(2)
_cell_length_b                   12.731(2)
_cell_length_c                   14.653(4)
_cell_measurement_reflns_used    174
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      9
_cell_volume                     2374.9(8)
_computing_cell_refinement       'XSCANS (Siemens, 1995c)'
_computing_data_collection       'XSCANS (Siemens, 1995c)'
_computing_data_reduction        'XSCANS (Siemens, 1995c)'
_computing_molecular_graphics    'SHELXTL (Siemens, 1995a)'
_computing_publication_material  'SHELXTL (Siemens, 1995a)'
_computing_structure_refinement  'SHELXTL (Siemens, 1995a)'
_computing_structure_solution    'SHELXTL (Siemens, 1995a)'
_diffrn_ambient_temperature      298(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       \w--2\q
_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  0.1253
_diffrn_reflns_av_sigmaI/netI    0.1033
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            3020
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         2.12
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_density_meas      ?
_exptl_crystal_description       needle
_exptl_crystal_F_000             936
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.107
_refine_diff_density_min         -0.114
_refine_diff_density_rms         0.026
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.39(163)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.092
_refine_ls_goodness_of_fit_obs   1.090
_refine_ls_hydrogen_treatment    'see text'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     156
_refine_ls_number_reflns         2082
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.095
_refine_ls_restrained_S_obs      1.090
_refine_ls_R_factor_all          0.0506
_refine_ls_R_factor_obs          0.0384
_refine_ls_shift/esd_max         -0.049
_refine_ls_shift/esd_mean        0.006
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0371P)^2^+0.2845P] where P=(Max(Fo^2^,0)+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0974
_refine_ls_wR_factor_obs         0.0888
_reflns_number_observed          1769
_reflns_number_total             2083
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            a800108sup1.cif
_cod_data_source_block           3
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0371P)^2^+0.2845P] where
P=(Max(Fo^2^,0)+2Fc^2^)/3' was changed to 'calc'. New tag
'_refine_ls_weighting_details' was created. The value of the new tag
was set to 'w=1/[\s^2^(Fo^2^)+(0.0371P)^2^+0.2845P] where
P=(Max(Fo^2^,0)+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        2374.8(7)
_cod_original_sg_symbol_H-M      'P 4~1~ 2~1~ 2'
_cod_database_code               7027837