1,3-Diacetyl-4-imidazolin-2-one
Crockett, Rowena; Forrester, Alexander R.; Howie, R. Alan; Acta Crystallographica Section E 60 (2004) o558–o560; doi:10.1107/S1600536804005756

data_2203383
_publ_section_title
;
 1,3-Diacetyl-4-imidazolin-2-one
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o558
_journal_page_last               o560
_journal_paper_doi               10.1107/S1600536804005756
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C7 H8 N2 O3'
_chemical_formula_moiety         'C7 H8 N2 O3'
_chemical_formula_sum            'C7 H8 N2 O3'
_chemical_formula_weight         168.15
_chemical_melting_point          '379 (lit. 379)'
_chemical_name_common            N,N'-diacetyl-1,3-diazo-2-one
_chemical_name_systematic
;
1,3-diacetyl-4-imidazolin-2-one
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.156(4)
_cell_length_b                   18.251(5)
_cell_length_c                   5.172(7)
_cell_measurement_reflns_used    14
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      10.3
_cell_measurement_theta_min      7.6
_cell_volume                     769.9(11)
_computing_cell_refinement       'Nicolet P3 Software'
_computing_data_collection       'Nicolet P3 Software (Nicolet, 1980)'
_computing_data_reduction        'RDNIC (Howie, 1980)'
_computing_molecular_graphics    'Ortep3 for Windows (Farrugia. 1997)'
_computing_publication_material  'SHELXL97 and PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Nicolet P3 four circle'
_diffrn_measurement_method       \q-2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.1652
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       0
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_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            990
_diffrn_reflns_theta_full        27.55
_diffrn_reflns_theta_max         27.55
_diffrn_reflns_theta_min         2.23
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 50
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.451
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             352
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         0.181
_refine_diff_density_min         -0.171
_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
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_refine_ls_number_reflns         990
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.1073
_refine_ls_R_factor_gt           0.0558
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0435P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0985
_refine_ls_wR_factor_ref         0.1132
_reflns_number_gt                621
_reflns_number_total             990
_reflns_threshold_expression     I>2\s(I)
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