1-Bromoethene-1-sulfonyl fluoride (BESF) is another good connective hub for SuFEx click chemistry.
Smedley, Christopher J.; Giel, Marie-Claire; Molino, Andrew; Barrow, Andrew S.; Wilson, David J. D.; Moses, John E.; Chemical communications (Cambridge, England) 54 (2018) 6020–6023; doi:10.1039/c8cc03400a

data_7121750
_publ_section_title
;
 1-Bromoethene-1-sulfonyl fluoride (BESF) is another good connective hub
 for SuFEx click chemistry.
;
_journal_issue                   47
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              6020
_journal_page_last               6023
_journal_paper_doi               10.1039/c8cc03400a
_journal_volume                  54
_journal_year                    2018
_chemical_formula_sum            'C11 H7 F N2 O5 S'
_chemical_formula_weight         298.25
_chemical_name_systematic
'(E)-3-(2-Nitrostyryl)isoxazole-5-sulfonyl fluoride'
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
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_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2018-04-24 deposited with the CCDC.
2018-05-18 downloaded from the CCDC.
;
_cell_angle_alpha                93.86(3)
_cell_angle_beta                 93.52(3)
_cell_angle_gamma                95.79(3)
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_cell_measurement_temperature    173(2)
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_cell_volume                     1200.2(4)
_computing_cell_refinement       'CrysAlisPro, Agilent Technologies'
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_computing_molecular_graphics    SHELXP
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_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Xcalibur, Atlas, Gemini'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0232
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_diffrn_reflns_limit_h_max       9
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_exptl_absorpt_process_details   'CrysAlisPro, Agilent Technologies'
_exptl_crystal_colour            colorless
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_exptl_crystal_density_method    'not measured'
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_refine_ls_R_factor_gt           0.0363
_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^)+(0.0623P)^2^+0.4910P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
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_refine_ls_wR_factor_ref         0.1120
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_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c8cc03400a2.cif
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_cod_depositor_comments          'Adding full bibliography for 7121750.cif.'
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7121750