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_7006433
_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 syn
_chemical_formula_moiety         'C8 H13 N O3'
_chemical_formula_sum            'C8 H13 N O3'
_chemical_formula_weight         171.19
_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-93
_cell_angle_alpha                90.00
_cell_angle_beta                 99.110(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.905(2)
_cell_length_b                   5.2560(10)
_cell_length_c                   9.185(3)
_cell_measurement_temperature    200(2)
_cell_volume                     424.48(19)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1999) '
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_measurement_device       'Nonius Kappa CCD'
_diffrn_measurement_method       'phi and omega scans with kappa offsets'
_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  0.036
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            8429
_diffrn_reflns_theta_max         27.45
_diffrn_reflns_theta_min         2.25
_exptl_absorpt_coefficient_mu    0.102
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.339
_exptl_crystal_description       plate
_exptl_crystal_F_000             184
_exptl_crystal_size_max          0.31
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.123
_refine_diff_density_min         -0.231
_refine_diff_density_rms         0.042
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.083
_refine_ls_goodness_of_fit_obs   1.108
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     116
_refine_ls_number_reflns         1924
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.083
_refine_ls_restrained_S_obs      1.108
_refine_ls_R_factor_all          0.0388
_refine_ls_R_factor_obs          0.0338
_refine_ls_shift/esd_max         0.002
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0459P)^2^+0.0221P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0832
_refine_ls_wR_factor_obs         0.0809
_reflns_number_gt                1747
_reflns_number_total             1924
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b510580c.txt
_cod_data_source_block           Chisholm1239
_cod_original_cell_volume        424.5(2)
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7006433