Practical synthesis of P-stereogenic diphosphacrowns.
Morisaki, Yasuhiro; Imoto, Hiroaki; Tsurui, Kazuhiko; Chujo, Yoshiki; Organic letters 11 (2009) 2241–2244; doi:10.1021/ol900504e

data_1503876
_publ_section_title
;
 Practical synthesis of P-stereogenic diphosphacrowns.
;
_journal_issue                   11
_journal_name_full               'Organic letters'
_journal_page_first              2241
_journal_page_last               2244
_journal_paper_doi               10.1021/ol900504e
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C24 H40 B2 O4 P2'
_chemical_formula_weight         476.12
_chemical_name_systematic
; 
 ? 
;
_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                 111.079(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.0669(14)
_cell_length_b                   25.664(4)
_cell_length_c                   10.9208(13)
_cell_measurement_temperature    113(2)
_cell_volume                     2632.7(6)
_computing_cell_refinement       PROCESS-AUTO
_computing_data_collection       PROCESS-AUTO
_computing_data_reduction        'Yadokari-XG (Wakita, 2000)'
_computing_molecular_graphics    'Yadokari-XG (Wakita, 2000)'
_computing_publication_material  'Yadokari-XG (Wakita, 2000)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      113(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.1017
_diffrn_reflns_av_sigmaI/netI    0.1481
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -33
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            25608
_diffrn_reflns_theta_full        27.44
_diffrn_reflns_theta_max         27.44
_diffrn_reflns_theta_min         3.11
_exptl_absorpt_coefficient_mu    0.192
_exptl_absorpt_correction_T_max  0.9810
_exptl_absorpt_correction_T_min  0.9446
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
    Higashi, T. (1995). Program for Absorption Correction.
    Rigaku Corporation, Tokyo, Japan.
;
_exptl_crystal_density_diffrn    1.201
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1024
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.370
_refine_diff_density_min         -0.320
_refine_diff_density_rms         0.057
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.03(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.670
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     581
_refine_ls_number_reflns         10346
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.670
_refine_ls_R_factor_all          0.0899
_refine_ls_R_factor_gt           0.0519
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1094
_refine_ls_wR_factor_ref         0.1276
_reflns_number_gt                6959
_reflns_number_total             10346
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            ol900504e_si_002.cif
_cod_data_source_block           untitled
_cod_original_sg_symbol_Hall     p_2yb
_cod_original_sg_symbol_H-M      p_21
_cod_database_code               1503876