Enantioselective Addition-Alkylation of α,β-Unsaturated Carbonyls via Bisguanidinium Silicate Ion Pair Catalysis
Chen, Wenchao; Ang, Esther Cai Xia; Tan, Siu Min; Chua, Zhijie; Ren, Jingyun; Yang, Ziqi; Teng, Bo; Lee, Richmond; Lu, Haihua; Tan, Choon-Hong; Journal of the American Chemical Society  (2020) –; doi:10.1021/jacs.0c00183

data_4135314
_publ_section_title
;
 Enantioselective Addition-Alkylation of \a,\b-Unsaturated Carbonyls via
 Bisguanidinium Silicate Ion Pair Catalysis
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.0c00183
_journal_year                    2020
_chemical_absolute_configuration ad
_chemical_formula_sum            'C18 H14 Br N O3'
_chemical_formula_weight         372.21
_space_group_crystal_system      trigonal
_space_group_IT_number           154
_space_group_name_Hall           'P 32 2"'
_space_group_name_H-M_alt        'P 32 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            12
_cell_length_a                   11.4685(2)
_cell_length_b                   11.4685(2)
_cell_length_c                   42.4860(10)
_cell_measurement_reflns_used    4289
_cell_measurement_temperature    100.(2)
_cell_measurement_theta_max      28.0290
_cell_measurement_theta_min      2.5047
_cell_volume                     4839.38(16)
_computing_cell_refinement       'SAINT V8.38A (Bruker AXS Inc., 2017)'
_computing_data_collection       'APEX3 (Bruker AXS Inc., 2018)'
_computing_data_reduction        'SAINT V8.38A (Bruker AXS Inc., 2017)'
_computing_molecular_graphics    'XP (Bruker AXS Inc., 2018)'
_computing_publication_material  'APEX3 (Bruker AXS Inc., 2018)'
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_computing_structure_solution    'XT, VERSION 2014/5'
_diffrn_ambient_temperature      100.(2)
_diffrn_detector_area_resol_mean 7.4074
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Photon II CPADs detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'Multilayer Mirror'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0549
_diffrn_reflns_av_unetI/netI     0.1021
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       50
_diffrn_reflns_limit_l_min       -57
_diffrn_reflns_number            17776
_diffrn_reflns_theta_full        28.70
_diffrn_reflns_theta_max         28.70
_diffrn_reflns_theta_min         2.81
_diffrn_source                   'Incoatec microfocus source'
_diffrn_source_type              'Bruker D8 Quest'
_exptl_absorpt_coefficient_mu    2.562
_exptl_absorpt_correction_T_max  0.78
_exptl_absorpt_correction_T_min  0.64
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 - Bruker AXS area detector scaling and absorption correction
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.533
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2256
_exptl_crystal_size_max          0.220
_exptl_crystal_size_mid          0.120
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.332
_refine_diff_density_min         -0.419
_refine_ls_abs_structure_details
;

Flack x determined using 1697 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.003(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.913
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     417
_refine_ls_number_reflns         7865
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.913
_refine_ls_R_factor_all          0.0776
_refine_ls_R_factor_gt           0.0425
_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^)] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0645
_refine_ls_wR_factor_ref         0.0757
_reflns_number_gt                5679
_reflns_number_total             7865
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja0c00183_si_007.cif
_cod_data_source_block           tch161m
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_absorpt_correction_type' value 'Multi-Scan' was
changed to 'multi-scan' in accordance with the
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 7556 2019-12-06 15:28:31Z antanas 
;
_cod_original_cell_volume        4839.4(2)
_cod_database_code               4135314
_shelx_res_checksum              70674
_shelx_hkl_checksum              27890