Well-Designed Phosphine-Urea Ligand for Highly Diastereo- and Enantioselective 1,3-Dipolar Cycloaddition of Methacrylonitrile: A Combined Experimental and Theoretical Study.
Xiong, Yang; Du, Zhuanzhuan; Chen, Haohua; Yang, Zhao; Tan, Qiuyuan; Zhang, Changhui; Zhu, Lei; Lan, Yu; Zhang, Min; Journal of the American Chemical Society 141 (2019) 961–971; doi:10.1021/jacs.8b10939

data_4133549
_publ_section_title
;
 Well-Designed Phosphine-Urea Ligand for Highly Diastereo- and
 Enantioselective 1,3-Dipolar Cycloaddition of Methacrylonitrile: A
 Combined Experimental and Theoretical Study.
;
_journal_issue                   2
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              961
_journal_page_last               971
_journal_paper_doi               10.1021/jacs.8b10939
_journal_volume                  141
_journal_year                    2019
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C20 H20 N2 O2'
_chemical_formula_sum            'C20 H20 N2 O2'
_chemical_formula_weight         320.38
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_audit_creation_date             2017-07-11
_audit_creation_method
;
Olex2 1.2-alpha
(compiled 2017.06.06 svn.r3414 for OlexSys, GUI svn.r5353)
;
_cell_angle_alpha                90
_cell_angle_beta                 90.581(7)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.3729(6)
_cell_length_b                   11.9190(13)
_cell_length_c                   15.7115(12)
_cell_measurement_reflns_used    1930
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      23.4500
_cell_measurement_theta_min      3.7640
_cell_volume                     1755.1(3)
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'SIR2004 (Burla et al., 2007)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 16.0892
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'SuperNova, Single source at offset, Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0319
_diffrn_reflns_av_unetI/netI     0.0794
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            7574
_diffrn_reflns_point_group_measured_fraction_full 0.826
_diffrn_reflns_point_group_measured_fraction_max 0.811
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.372
_diffrn_reflns_theta_min         3.367
_diffrn_source                   'SuperNova (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.079
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.19095
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.41k (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.212
_exptl_crystal_description       Block
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.227
_refine_diff_density_min         -0.200
_refine_diff_density_rms         0.049
_refine_ls_abs_structure_details
;
 Flack x determined using 881 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.7(10)
_refine_ls_extinction_coef       0.020(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     446
_refine_ls_number_reflns         5811
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.1206
_refine_ls_R_factor_gt           0.0821
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0782P)^2^+1.2530P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1994
_refine_ls_wR_factor_ref         0.2303
_reflns_Friedel_coverage         0.550
_reflns_Friedel_fraction_full    0.635
_reflns_Friedel_fraction_max     0.606
_reflns_number_gt                3679
_reflns_number_total             5811
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b10939_si_004.cif
_cod_data_source_block           dzz
_cod_database_code               4133549
_shelx_shelxl_version_number     2014/7
_oxdiff_exptl_absorpt_empirical_full_min 0.372
_oxdiff_exptl_absorpt_empirical_full_max 2.574
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C8(H8), C25(H25)
2.b Secondary CH2 refined with riding coordinates:
 C5(H5A,H5B), C28(H28A,H28B)
2.c Aromatic/amide H refined with riding coordinates:
 C14(H14), C34(H34), C10(H10), C31(H31), C20(H20), C33(H33), C13(H13),
 C16(H16), C30(H30), C32(H32), C12(H12), C40(H40), C11(H11), C36(H36), C39(H39),
  C17(H17), C19(H19), C38(H38), C18(H18), C37(H37)
2.d Idealised Me refined as rotating group:
 C24(H24A,H24B,H24C), C4(H4A,H4B,H4C), C1(H1A,H1B,H1C), C21(H21A,H21B,H21C)
;
_olex2_submission_special_instructions 'No special instructions were received'