Tetrakis(trifluoromethanesulfonyl)propane: highly effective Brønsted acid catalyst for vinylogous Mukaiyama-Michael reaction of alpha,beta-enones with silyloxyfurans.
Takahashi, Arata; Yanai, Hikaru; Taguchi, Takeo; Chemical communications (Cambridge, England)  (2008) 2385–2387; doi:10.1039/b800815a

data_7103130
_publ_section_title
;
 Tetrakis(trifluoromethanesulfonyl)propane: highly effective Br\/onsted
 acid catalyst for vinylogous Mukaiyama-Michael reaction of
 alpha,beta-enones with silyloxyfurans.
;
_journal_issue                   20
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              2385
_journal_page_last               2387
_journal_paper_doi               10.1039/b800815a
_journal_year                    2008
_chemical_formula_moiety         'C7 H4 F12 O8 S4'
_chemical_formula_sum            'C7 H4 F12 O8 S4'
_chemical_formula_weight         572.34
_chemical_name_common
1,1,3,3-tetrakis(trifluoromethanesulfonyl)propane
_chemical_name_systematic
;
1,1,3,3-tetrakis(trifluoromethanesulfonyl)propane
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2008-01-17
_audit_creation_method           'SHELXL97 '
_cell_angle_alpha                90.00
_cell_angle_beta                 103.5850(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.9367(9)
_cell_length_b                   16.5820(15)
_cell_length_c                   10.9892(10)
_cell_measurement_reflns_used    3579
_cell_measurement_temperature    100
_cell_measurement_theta_max      27.62
_cell_measurement_theta_min      2.44
_cell_volume                     1760.0(3)
_computing_cell_refinement       'APEX2 (Bruker AXS, 2006)'
_computing_data_collection       'APEX2 (Bruker AXS, 2006)'
_computing_data_reduction        'SAINT (Bruker AXS, 2004)'
_computing_molecular_graphics    'XSHEL (Bruker AXS,2002)'
_computing_publication_material  'XCIF (Bruker AXS, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'multilayer confocal mirror'
_diffrn_radiation_source         'fine-focus rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0237
_diffrn_reflns_av_sigmaI/netI    0.0329
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            9655
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         2.11
_exptl_absorpt_coefficient_mu    0.702
_exptl_absorpt_correction_T_max  0.9657
_exptl_absorpt_correction_T_min  0.8609
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
;
SADABS Sheldrick 1996
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    2.160
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1128
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.421
_refine_diff_density_min         -0.400
_refine_diff_density_rms         0.065
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     280
_refine_ls_number_reflns         3932
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.021
_refine_ls_R_factor_all          0.0384
_refine_ls_R_factor_gt           0.0284
_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^)+(0.0276P)^2^+0.8892P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0621
_refine_ls_wR_factor_ref         0.0666
_reflns_number_gt                3263
_reflns_number_total             3932
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b800815a.txt
_cod_data_source_block           1
_cod_original_sg_symbol_H-M      'P 21/C '
_cod_database_code               7103130