P-chirogenic Diphosphazanes with Axially Chiral Substituents and their Use in Rh-catalyzed Asymmetric Hydrogenation.
Moritz, Jan-Ole; Chakrabortty, Soumyadeep; Müller, Bernd H; Spannenberg, Anke; Kamer, Paul C. J.; The Journal of organic chemistry  (2020) –; doi:10.1021/acs.joc.0c01108

data_4038831
_publ_section_title
;
 P-chirogenic Diphosphazanes with Axially Chiral Substituents and their
 Use in Rh-catalyzed Asymmetric Hydrogenation.
;
_journal_name_full               'The Journal of organic chemistry'
_journal_paper_doi               10.1021/acs.joc.0c01108
_journal_year                    2020
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C20 H27 N O2 P2'
_chemical_formula_sum            'C20 H27 N O2 P2'
_chemical_formula_weight         375.36
_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
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.8560(2)
_cell_length_b                   11.5291(2)
_cell_length_c                   17.2583(4)
_cell_measurement_reflns_used    9912
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      30.45
_cell_measurement_theta_min      2.95
_cell_volume                     1961.07(7)
_computing_cell_refinement       'SAINT (Bruker, 2013)'
_computing_data_collection       'APEX2 (Bruker, 2014)'
_computing_data_reduction        SAINT
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0256
_diffrn_reflns_av_unetI/netI     0.0199
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            24174
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.992
_diffrn_reflns_theta_min         2.124
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.235
_exptl_absorpt_correction_T_max  0.96
_exptl_absorpt_correction_T_min  0.92
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2014)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.271
_exptl_crystal_description       prism
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.359
_exptl_crystal_size_mid          0.353
_exptl_crystal_size_min          0.177
_refine_diff_density_max         0.282
_refine_diff_density_min         -0.194
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details
;
 Flack x determined using 1904 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.03(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     230
_refine_ls_number_reflns         4716
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0306
_refine_ls_R_factor_gt           0.0286
_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^)+(0.0446P)^2^+0.3722P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0738
_refine_ls_wR_factor_ref         0.0755
_reflns_Friedel_coverage         0.764
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                4512
_reflns_number_total             4716
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo0c01108_si_003.cif
_cod_data_source_block           AX1773
_cod_database_code               4038831
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              87428
_shelx_hkl_checksum              91791