Chiral ionic liquids: synthesis, properties, and enantiomeric recognition.
Yu, Shaofang; Lindeman, Sergey; Tran, Chieu D.; The Journal of organic chemistry 73 (2008) 2576–2591; doi:10.1021/jo702368t

data_4029538
_publ_section_title
;
 Chiral ionic liquids: synthesis, properties, and enantiomeric
 recognition.
;
_journal_issue                   7
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              2576
_journal_page_last               2591
_journal_paper_doi               10.1021/jo702368t
_journal_volume                  73
_journal_year                    2008
_chemical_absolute_configuration rm
_chemical_formula_sum            'C26 H31 B N2 O6'
_chemical_formula_weight         478.34
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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                 104.5640(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.3437(8)
_cell_length_b                   10.8094(9)
_cell_length_c                   13.0215(11)
_cell_measurement_reflns_used    9055
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      31
_cell_measurement_theta_min      2
_cell_volume                     1272.91(19)
_computing_cell_refinement       'SAINT v7.23A (Bruker, 2005)'
_computing_data_collection       'APEX2 v1.0-27 (Bruker, 2005)'
_computing_data_reduction        'SADABS-2004/1 (Bruker, 2005)'
_computing_molecular_graphics    'XP v5.1 (Bruker, 1998)'
_computing_publication_material  'XCIF v6.12 (Bruker, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.946
_diffrn_measured_fraction_theta_max 0.946
_diffrn_measurement_device_type  'Bruker APEX2 CCD detector'
_diffrn_measurement_method       'omega scan'
_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  0.0230
_diffrn_reflns_av_sigmaI/netI    0.0254
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            20587
_diffrn_reflns_theta_full        31.91
_diffrn_reflns_theta_max         31.91
_diffrn_reflns_theta_min         1.62
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.9869
_exptl_absorpt_correction_T_min  0.9451
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             508
_exptl_crystal_size_max          0.65
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.457
_refine_diff_density_min         -0.176
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.2(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.067
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     316
_refine_ls_number_reflns         8096
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.067
_refine_ls_R_factor_all          0.0425
_refine_ls_R_factor_gt           0.0384
_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^)+(0.0655P)^2^+0.0474P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1012
_refine_ls_wR_factor_ref         0.1041
_reflns_number_gt                7426
_reflns_number_total             8096
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo702368t-file002.cif
_cod_data_source_block           trana
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               4029538