Lewis Acid-Catalyzed Selective [2 + 2]-Cycloaddition and Dearomatizing Cascade Reaction of Aryl Alkynes with Acrylates.
Shen, Liang; Zhao, Kai; Doitomi, Kazuki; Ganguly, Rakesh; Li, Yong-Xin; Shen, Zhi-Liang; Hirao, Hajime; Loh, Teck-Peng; Journal of the American Chemical Society  (2017) –; doi:10.1021/jacs.7b07997

data_4126421
_publ_section_title
;
 Lewis Acid-Catalyzed Selective [2 + 2]-Cycloaddition and Dearomatizing
 Cascade Reaction of Aryl Alkynes with Acrylates.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.7b07997
_journal_year                    2017
_chemical_formula_sum            'C22 H24 Br2 O2'
_chemical_formula_weight         480.23
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_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   difmap
_cell_angle_alpha                90
_cell_angle_beta                 105.775(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.9006(12)
_cell_length_b                   12.1348(10)
_cell_length_c                   14.5838(11)
_cell_measurement_reflns_used    5140
_cell_measurement_temperature    153.(2)
_cell_measurement_theta_max      26.0977
_cell_measurement_theta_min      3.0810
_cell_volume                     2026.7(3)
_computing_cell_refinement       'SAINT V8.27B (Bruker AXS Inc., 2012)'
_computing_data_reduction        'SAINT V8.27B (Bruker AXS Inc., 2012)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      153.(2)
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0897
_diffrn_reflns_av_sigmaI/netI    0.0796
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            38959
_diffrn_reflns_theta_full        32.25
_diffrn_reflns_theta_max         32.25
_diffrn_reflns_theta_min         3.08
_exptl_absorpt_coefficient_mu    4.013
_exptl_absorpt_correction_T_max  0.40
_exptl_absorpt_correction_T_min  0.19
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2012/1 (Bruker AXS Inc.)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.574
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             968
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.320
_exptl_crystal_size_min          0.280
_refine_diff_density_max         0.767
_refine_diff_density_min         -1.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.997
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     238
_refine_ls_number_reflns         7153
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.997
_refine_ls_R_factor_all          0.1027
_refine_ls_R_factor_gt           0.0468
_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^)+(0.0387P)^2^+0.9631P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0823
_refine_ls_wR_factor_ref         0.0984
_reflns_number_gt                4494
_reflns_number_total             7153
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja7b07997_si_003.cif
_cod_data_source_block           I
_cod_database_code               4126421