Preparation of tetraalkylformamidinium salts and related species as precursors to stable carbenes
Alder, Roger W.; Blake, Michael E.; Bufali, Simone; Butts, Craig P.; Orpen, A. Guy; Schütz, Jan; Williams, Stuart J.; Journal of the Chemical Society, Perkin Transactions 1  (2001) 1586–; doi:10.1039/b104110j

data_7213491
_publ_section_title
;
 Preparation of tetraalkylformamidinium salts and related species as
 precursors to stable carbenes
;
_journal_issue                   14
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              1586
_journal_paper_doi               10.1039/b104110j
_journal_year                    2001
_chemical_formula_sum            'C16 H30 F6 N2 O7 S2'
_chemical_formula_weight         540.54
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   11.3218(13)
_cell_length_b                   17.900(2)
_cell_length_c                   24.468(4)
_cell_measurement_reflns_used    210
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      1.75
_cell_volume                     4958.7(11)
_computing_cell_refinement       'SMART (Siemens, 1995b)'
_computing_data_collection       'SMART (Siemens, 1995b)'
_computing_data_reduction        'SMART (Siemens, 1995b)'
_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      173(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       '\w 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  0.0345
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_diffrn_reflns_limit_h_max       1
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            2689
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         2.29
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.297
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.448
_exptl_crystal_description       Rectangular
_exptl_crystal_F_000             2256
_exptl_crystal_size_max          .60
_exptl_crystal_size_mid          .42
_exptl_crystal_size_min          .32
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_refine_ls_hydrogen_treatment    noref
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_refine_ls_number_reflns         2193
_refine_ls_number_restraints     0
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_refine_ls_restrained_S_obs      1.123
_refine_ls_R_factor_all          0.0914
_refine_ls_R_factor_gt           0.0472
_refine_ls_shift/esd_mean        0.000
_refine_ls_shift/su_max          0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1086
_refine_ls_wR_factor_ref         0.0841
_reflns_number_gt                1457
_reflns_number_total             2194
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b104110jsup1.cif
_cod_data_source_block           didicat
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_cell_volume        4958.5(12)
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7213491