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_4126417
_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            'C24 H28 Br2 O2'
_chemical_formula_weight         508.28
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_cell_angle_alpha                92.876(3)
_cell_angle_beta                 96.754(2)
_cell_angle_gamma                97.138(2)
_cell_formula_units_Z            2
_cell_length_a                   7.8298(3)
_cell_length_b                   10.7707(4)
_cell_length_c                   13.5049(5)
_cell_measurement_reflns_used    4864
_cell_measurement_temperature    103.(2)
_cell_measurement_theta_max      25.7114
_cell_measurement_theta_min      2.3625
_cell_volume                     1119.80(7)
_computing_cell_refinement       'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_data_collection       'APEX2 (Bruker AXS Inc., 2014)'
_computing_data_reduction        'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_molecular_graphics    'XP (Bruker AXS Inc., 2014)'
_computing_publication_material  'APEX2 (Bruker AXS Inc., 2014)'
_computing_structure_refinement  'SHELXL-2014/6 (Sheldrick, 2014)'
_diffrn_ambient_temperature      103.(2)
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0727
_diffrn_reflns_av_unetI/netI     0.0691
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            31905
_diffrn_reflns_theta_full        31.11
_diffrn_reflns_theta_max         31.11
_diffrn_reflns_theta_min         2.64
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    3.636
_exptl_absorpt_correction_T_max  0.53
_exptl_absorpt_correction_T_min  0.35
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2014/4 (Bruker AXS Inc.)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.507
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             516
_exptl_crystal_size_max          0.420
_exptl_crystal_size_mid          0.260
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.669
_refine_diff_density_min         -0.529
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.007
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     256
_refine_ls_number_reflns         7194
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.007
_refine_ls_R_factor_all          0.0729
_refine_ls_R_factor_gt           0.0380
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0237P)^2^+0.2362P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0655
_refine_ls_wR_factor_ref         0.0742
_reflns_number_gt                5046
_reflns_number_total             7194
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b07997_si_005.cif
_cod_data_source_block           I
_cod_database_code               4126417
_shelx_res_checksum              22354
_shelx_hkl_checksum              99284