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_7006431
_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_formula_sum            'C46 H58 N2 O8 Sn2'
_chemical_formula_weight         1004.32
_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     heavy
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 96.518(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   12.2393(10)
_cell_length_b                   14.3304(10)
_cell_length_c                   13.4490(10)
_cell_measurement_temperature    200(2)
_cell_volume                     2343.6(3)
_computing_cell_refinement       'DENZO (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1999)'
_computing_data_reduction        'DENZO (Otwinowski & Minor, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      203(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'phi and omega scans'
_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  0.037
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            45817
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.13
_exptl_absorpt_coefficient_mu    1.117
_exptl_absorpt_correction_T_max  0.809
_exptl_absorpt_correction_T_min  0.662
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'HKL Scalepack (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.423
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'irregular chunk'
_exptl_crystal_F_000             1024
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.19
_refine_diff_density_max         0.513
_refine_diff_density_min         -0.507
_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   0.000(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     534
_refine_ls_number_reflns         10735
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0337
_refine_ls_R_factor_gt           0.0247
_refine_ls_shift/su_max          0.1
_refine_ls_shift/su_mean         0.008
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0225P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0480
_refine_ls_wR_factor_ref         0.0504
_reflns_number_gt                9401
_reflns_number_total             10735
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b510580c.txt
_cod_data_source_block           Chisholm1228
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7006431