Enantioselective isothiourea-catalysed reversible Michael addition of aryl esters to 2-benzylidene malononitriles.
Nimmo, Alastair J.; Bitai, Jacqueline; Young, Claire M.; McLaughlin, Calum; Slawin, Alexandra M. Z.; Cordes, David B.; Smith, Andrew D.; Chemical science 14 (2023) 7537–7544; doi:10.1039/d3sc02101g

data_1569766
_publ_section_title
;
 Enantioselective isothiourea-catalysed reversible Michael addition of
 aryl esters to 2-benzylidene malononitriles.
;
_journal_issue                   27
_journal_name_full               'Chemical science'
_journal_page_first              7537
_journal_page_last               7544
_journal_paper_doi               10.1039/d3sc02101g
_journal_volume                  14
_journal_year                    2023
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C25 H16 F4 N2 O2'
_chemical_formula_sum            'C25 H16 F4 N2 O2'
_chemical_formula_weight         452.41
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2021-05-25
_audit_creation_method           'by CrystalStructure 4.3'
_audit_update_record
;
2023-04-04 deposited with the CCDC.	2023-06-01 downloaded from the CCDC.
;
_cell_angle_alpha                90.0000
_cell_angle_beta                 90.0000
_cell_angle_gamma                90.0000
_cell_formula_units_Z            4
_cell_length_a                   5.87366(8)
_cell_length_b                   9.56529(13)
_cell_length_c                   36.9186(4)
_cell_measurement_reflns_used    15197
_cell_measurement_temperature    173
_cell_measurement_theta_max      68.04
_cell_measurement_theta_min      2.42
_cell_volume                     2074.21(5)
_computing_cell_refinement       'CrysAlisPro 1.171.40.14a (Rigaku OD, 2018)'
_computing_data_collection       'CrysAlisPro 1.171.40.14a (Rigaku OD, 2018)'
_computing_data_reduction        'CrysAlisPro 1.171.40.14a (Rigaku OD, 2018)'
_computing_molecular_graphics    'CrystalStructure 4.3'
_computing_publication_material  'CrystalStructure 4.3 (Rigaku, 2019)'
_computing_structure_refinement  'SHELXL Version 2018/3 (Sheldrick, 2008)'
_computing_structure_solution    'SIR2011 (Burla, et al., 2012)'
_diffrn_ambient_temperature      173
_diffrn_detector_area_resol_mean 5.811
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Rigaku XtaLAB P100'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0287
_diffrn_reflns_av_unetI/netI     0.0199
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -44
_diffrn_reflns_number            20708
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.991
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         68.152
_diffrn_reflns_theta_min         4.791
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.005
_exptl_absorpt_correction_T_max  0.970
_exptl_absorpt_correction_T_min  0.777
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.40.14a (Rigaku Oxford Diffraction, 2018)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.449
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             928.00
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: Toluene'
_exptl_crystal_size_max          0.180
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.030
_refine_diff_density_max         0.45
_refine_diff_density_min         -0.54
_refine_ls_abs_structure_details
;
 Flack x determined using 1517 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.01(3)
_refine_ls_extinction_coef       0.059(3)
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.230
_refine_ls_hydrogen_treatment    constr
_refine_ls_number_parameters     300
_refine_ls_number_reflns         3758
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0513
_refine_ls_R_factor_gt           0.0513
_refine_ls_shift/su_max          0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0754P)^2^+0.1558P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1078
_refine_ls_wR_factor_ref         0.1079
_reflns_Friedel_coverage         0.684
_reflns_Friedel_fraction_full    0.991
_reflns_Friedel_fraction_max     0.982
_reflns_number_gt                3754
_reflns_number_total             3758
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            d3sc02101g2.cif
_cod_data_source_block           14
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               1569766
_shelx_res_checksum              41041
_shelx_hkl_checksum              17532