Base-Promoted Formal [4 + 3] Annulation between 2-Fluorophenylacetylenes and Ketones: A Route to Benzoxepines.
Ouyang, Lu; Qi, Chaorong; He, Haitao; Peng, Youbin; Xiong, Wenfang; Ren, Yanwei; Jiang, Huanfeng; The Journal of organic chemistry 81 (2016) 912–919; doi:10.1021/acs.joc.5b02487

data_4031924
_publ_section_title
;
 Base-Promoted Formal [4 + 3] Annulation between 2-Fluorophenylacetylenes
 and Ketones: A Route to Benzoxepines.
;
_journal_issue                   3
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              912
_journal_page_last               919
_journal_paper_doi               10.1021/acs.joc.5b02487
_journal_volume                  81
_journal_year                    2016
_chemical_formula_sum            'C18 H14 O'
_chemical_formula_weight         246.29
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.4783(13)
_cell_length_b                   8.4999(17)
_cell_length_c                   23.571(5)
_cell_measurement_temperature    293(2)
_cell_volume                     1297.9(5)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Rigaku CCD'
_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  0.0233
_diffrn_reflns_av_sigmaI/netI    0.0257
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            12729
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         3.26
_exptl_absorpt_coefficient_mu    0.077
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.260
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             520
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.122
_refine_diff_density_min         -0.113
_refine_diff_density_rms         0.028
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   2.7(14)
_refine_ls_extinction_coef       0.013(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   0.914
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     181
_refine_ls_number_reflns         2963
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.914
_refine_ls_R_factor_all          0.0580
_refine_ls_R_factor_gt           0.0276
_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^)+(0.0516P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0686
_refine_ls_wR_factor_ref         0.0833
_reflns_number_gt                1865
_reflns_number_total             2963
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo5b02487_si_003.cif
_cod_data_source_block           qi
_cod_original_cell_volume        1297.9(4)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               4031924