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_7151751
_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 O2'
_chemical_formula_sum            'C18 H8 F2 O2'
_chemical_formula_weight         294.24
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 97.211(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.198(2)
_cell_length_b                   6.525(2)
_cell_length_c                   15.416(5)
_cell_measurement_reflns_used    519
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      23.55
_cell_measurement_theta_min      3.32
_cell_volume                     618.5(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 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker APEX 2 CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_diffrn_radiation_monochromator  'silicon 111'
_diffrn_radiation_source         'Daresbury SRS station 9.8'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.6942
_diffrn_reflns_av_R_equivalents  0.0501
_diffrn_reflns_av_sigmaI/netI    0.0634
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            2656
_diffrn_reflns_theta_full        22.99
_diffrn_reflns_theta_max         22.99
_diffrn_reflns_theta_min         3.32
_diffrn_standards_decay_%        4
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.123
_exptl_absorpt_correction_T_max  0.999
_exptl_absorpt_correction_T_min  0.992
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS v2008/1, Sheldrick, G.M., (2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.580
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       lath
_exptl_crystal_F_000             300
_exptl_crystal_size_max          0.07
_exptl_crystal_size_mid          0.01
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.974
_refine_diff_density_min         -0.315
_refine_diff_density_rms         0.094
_refine_ls_extinction_coef       0.8(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     101
_refine_ls_number_reflns         907
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.1365
_refine_ls_R_factor_gt           0.0949
_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^)+(0.1905P)^2^+0.7738P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2480
_refine_ls_wR_factor_ref         0.2902
_reflns_number_gt                588
_reflns_number_total             907
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c0ob00790k.txt
_cod_data_source_block           22
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7151751