Synthesis of fluorinated fused benzofurans and benzothiophenes: Smiles-type rearrangement and cyclisation of perfluoro(het)aryl ethers and sulfides.
Ponce González, Julia; Edgar, Mark; Elsegood, Mark R. J.; Weaver, George W.; Organic & biomolecular chemistry 9 (2011) 2294–2305; doi:10.1039/c0ob00790k

data_7151754
_publ_section_title
;
 Synthesis of fluorinated fused benzofurans and benzothiophenes:
 Smiles-type rearrangement and cyclisation of perfluoro(het)aryl ethers
 and sulfides.
;
_journal_issue                   7
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              2294
_journal_page_last               2305
_journal_paper_doi               10.1039/c0ob00790k
_journal_volume                  9
_journal_year                    2011
_chemical_formula_moiety         'C18 H8 F2 S2'
_chemical_formula_sum            'C18 H8 F2 S2'
_chemical_formula_weight         326.36
_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   'all non-H atoms found by direct methods'
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 92.499(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.823(2)
_cell_length_b                   3.9110(12)
_cell_length_c                   21.623(7)
_cell_measurement_reflns_used    1598
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      26.39
_cell_measurement_theta_min      2.61
_cell_volume                     660.9(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX 2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX 2 CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_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  0.0623
_diffrn_reflns_av_sigmaI/netI    0.0647
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            4059
_diffrn_reflns_theta_full        26.43
_diffrn_reflns_theta_max         26.43
_diffrn_reflns_theta_min         1.89
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.417
_exptl_absorpt_correction_T_max  0.992
_exptl_absorpt_correction_T_min  0.800
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS v2007/4, Sheldrick, G.M., (2007)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.640
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       lath
_exptl_crystal_F_000             332
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.501
_refine_diff_density_min         -0.306
_refine_diff_density_rms         0.087
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.079
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     100
_refine_ls_number_reflns         1347
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.079
_refine_ls_R_factor_all          0.0761
_refine_ls_R_factor_gt           0.0559
_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^)+(0.0684P)^2^+0.3261P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1285
_refine_ls_wR_factor_ref         0.1366
_reflns_number_gt                1022
_reflns_number_total             1347
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c0ob00790k.txt
_cod_data_source_block           34
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7151754