Comments on the ring-opening polymerization of morpholine-2,5-dione derivatives by various metal catalysts and characterization of the products formed in the reactions involving R2SnX2, where X = OPr(i) and NMe2 and R = Bu(n), Ph and p-Me2NC6H4.
Chisholm, M. H.; Galucci, J.; Krempner, C.; Wiggenhorn, C.; Dalton transactions (Cambridge, England : 2003)  (2006) 846–851; doi:10.1039/b510580c

data_7006434
_publ_section_title
;
 Comments on the ring-opening polymerization of morpholine-2,5-dione
 derivatives by various metal catalysts and characterization of the
 products formed in the reactions involving R2SnX2, where X = OPr(i)
 and NMe2 and R = Bu(n), Ph and p-Me2NC6H4.
;
_journal_issue                   6
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              846
_journal_page_last               851
_journal_paper_doi               10.1039/b510580c
_journal_year                    2006
_chemical_absolute_configuration ad
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C32 H64 N4 O6 Sn2'
_chemical_formula_sum            'C32 H64 N4 O6 Sn2'
_chemical_formula_weight         838.29
_chemical_name_common            'Chisholm 1284'
_chemical_name_systematic
;
?
;
_space_group_IT_number           154
_symmetry_cell_setting           trigonal
_symmetry_Int_Tables_number      154
_symmetry_space_group_name_Hall  'P 32 2"'
_symmetry_space_group_name_H-M   'P 32 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     heavy
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.2
_audit_creation_date             2005-02-10T14:51:38-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            3
_cell_length_a                   17.406(1)
_cell_length_b                   17.406(1)
_cell_length_c                   11.737(1)
_cell_measurement_reflns_used    4718
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      2.037
_cell_measurement_wavelength     0.71073
_cell_volume                     3079.5(4)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'phi and omega scans'
_diffrn_orient_matrix_type       'by Nonius Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      0.284911E-1
_diffrn_orient_matrix_UB_12      0.60773E-1
_diffrn_orient_matrix_UB_13      -0.340466E-1
_diffrn_orient_matrix_UB_21      0.389923E-1
_diffrn_orient_matrix_UB_22      0.243959E-1
_diffrn_orient_matrix_UB_23      0.68544E-1
_diffrn_orient_matrix_UB_31      0.454841E-1
_diffrn_orient_matrix_UB_32      -0.106031E-1
_diffrn_orient_matrix_UB_33      -0.374342E-1
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.048
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            9356
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.2
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    1.257
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.356
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             1296
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.84
_refine_diff_density_min         -0.408
_refine_diff_density_rms         0.071
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     194
_refine_ls_number_reflns         4718
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0411
_refine_ls_R_factor_gt           0.0306
_refine_ls_shift/su_max          0.095
_refine_ls_shift/su_mean         0.007
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0452P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0704
_refine_ls_wR_factor_ref         0.074
_reflns_number_gt                4057
_reflns_number_total             4718
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b510580c.txt
_cod_data_source_block           Chisholm1284
_cod_original_cell_volume        3079.6(4)
_cod_database_code               7006434