1-Methoxypyrrolidine-2,5-dione
Ray J. Butcher; Hijji, Yousef M.; Benjamin, Ellis; Acta Crystallographica Section E 63 (2007) o1502–o1503; doi:10.1107/S1600536807008549

data_2212621
_publ_section_title
;
 1-Methoxypyrrolidine-2,5-dione
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_journal_coeditor_code           KP2077
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1502
_journal_page_last               o1503
_journal_paper_doi               10.1107/S1600536807008549
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          'C5 H7 N O3'
_chemical_formula_moiety         'C5 H7 N O3'
_chemical_formula_sum            'C5 H7 N O3'
_chemical_formula_weight         129.12
_chemical_name_systematic
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1-Methoxypyrrolidine-2,5-dione
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 105.964(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.6549(18)
_cell_length_b                   7.553(2)
_cell_length_c                   12.105(3)
_cell_measurement_reflns_used    4623
_cell_measurement_temperature    103(2)
_cell_measurement_theta_max      30.67
_cell_measurement_theta_min      3.18
_cell_volume                     585.0(3)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        'SAINT (Bruker, 2002)'
_computing_molecular_graphics    'SHELXTL (Bruker, 2000)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      103(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.935
_diffrn_measurement_device_type  'Bruker APEX2 CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_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  0.0169
_diffrn_reflns_av_sigmaI/netI    0.0141
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6344
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         30.81
_diffrn_reflns_theta_min         3.22
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.122
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.840
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2000)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.466
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             272
_exptl_crystal_size_max          0.37
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.418
_refine_diff_density_min         -0.216
_refine_ls_extinction_coef       0.072(15)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.058
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     84
_refine_ls_number_reflns         1715
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.058
_refine_ls_R_factor_all          0.0371
_refine_ls_R_factor_gt           0.0347
_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^)+(0.0533P)^2^+0.1538P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0942
_refine_ls_wR_factor_ref         0.0960
_reflns_number_gt                1578
_reflns_number_total             1715
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            kp2077.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2212621
_cod_database_fobs_code          2212621