Chiral N-heterocyclic carbene/Lewis acid cooperative catalysis of the reaction of 2-aroylvinylcinnamaldehydes: a switch of the reaction pathway by Lewis acid activation
Zhan-Yong Wang; Ya-Li Ding; Gang Wang; Ying Cheng; Chem.Commun. 52 (2016) 788–; doi:

data_7118480
_publ_section_title
;
 Chiral N-heterocyclic carbene/Lewis acid cooperative catalysis of the
 reaction of 2-aroylvinylcinnamaldehydes: a switch of the reaction pathway
 by Lewis acid activation
;
_journal_name_full               Chem.Commun.
_journal_page_first              788
_journal_volume                  52
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_sum            'C36 H26 Br2 O4'
_chemical_formula_weight         682.39
_chemical_name_systematic
; 
 ? 
;
_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
_audit_update_record
;
2015-10-22 deposited with the CCDC.
2015-11-06 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.6288(11)
_cell_length_b                   12.578(3)
_cell_length_c                   41.669(8)
_cell_measurement_reflns_used    5189
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.00
_cell_measurement_theta_min      0.98
_cell_volume                     2950.1(11)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2007)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device
;
Saturn724+ (2x2 bin mode)
;
_diffrn_measurement_method       dtprofit.ref
_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  0.0749
_diffrn_reflns_av_sigmaI/netI    0.0420
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       49
_diffrn_reflns_limit_l_min       -49
_diffrn_reflns_number            30944
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         0.98
_exptl_absorpt_coefficient_mu    2.788
_exptl_absorpt_correction_T_max  0.0000
_exptl_absorpt_correction_T_min  0.0000
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.536
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1376
_exptl_crystal_size_max          0.09
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.02
_refine_diff_density_max         1.705
_refine_diff_density_min         -0.837
_refine_diff_density_rms         0.152
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.044(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.001
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     379
_refine_ls_number_reflns         5189
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.001
_refine_ls_R_factor_all          0.0777
_refine_ls_R_factor_gt           0.0698
_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^)+(0.0500P)^2^+15.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1496
_refine_ls_wR_factor_ref         0.1646
_reflns_number_gt                4767
_reflns_number_total             5189
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5cc08866f2.cif
_cod_data_source_block           a
_cod_original_cell_volume        2950.0(10)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7118480