Enantioselective Brønsted Base Catalysis with Chiral Cyclopropenimines
Jeffrey S. Bandar; Tristan H. Lambert; Journal of the American Chemical Society 134 (2012) 5552–5555; doi:10.1021/ja3015764

data_4117746
_publ_section_title
;
 Enantioselective Br\/onsted Base Catalysis with Chiral Cyclopropenimines
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5552
_journal_page_last               5555
_journal_paper_doi               10.1021/ja3015764
_journal_volume                  134
_journal_year                    2012
_chemical_absolute_configuration ad
_chemical_formula_sum            'C36 H58 Cl N3 O2'
_chemical_formula_weight         600.30
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           145
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  'P 32'
_symmetry_space_group_name_H-M   'P 32'
_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                120.00
_cell_formula_units_Z            3
_cell_length_a                   15.8650(10)
_cell_length_b                   15.8650(10)
_cell_length_c                   11.7214(8)
_cell_measurement_reflns_used    9941
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      31.79
_cell_measurement_theta_min      2.28
_cell_volume                     2555.0(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0294
_diffrn_reflns_av_sigmaI/netI    0.0305
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            44296
_diffrn_reflns_theta_full        31.96
_diffrn_reflns_theta_max         31.96
_diffrn_reflns_theta_min         1.48
_exptl_absorpt_coefficient_mu    0.147
_exptl_absorpt_correction_T_max  0.9490
_exptl_absorpt_correction_T_min  0.9490
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            COLORLESS
_exptl_crystal_density_diffrn    1.170
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             984
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.36
_refine_diff_density_max         0.423
_refine_diff_density_min         -0.159
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.01(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     381
_refine_ls_number_reflns         11637
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0598
_refine_ls_R_factor_gt           0.0448
_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^)+(0.0698P)^2^+0.1617P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1095
_refine_ls_wR_factor_ref         0.1195
_reflns_number_gt                9620
_reflns_number_total             11637
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja3015764_si_002.cif
_cod_data_source_block           jbs10
_cod_database_code               4117746