1-(2-Cyclohex-2-enylpropionyl)-3-methylurea, 2-ethyl-5-methylhexanamide and 2-ethylpentanamide: three products of barbiturate decomposition
Nichol, Gary S.; Clegg, William; Acta Crystallographica Section C 67 (2011) o13–o17; doi:10.1107/S0108270110049322

data_2017950
_publ_section_title
;
 1-(2-Cyclohex-2-enylpropionyl)-3-methylurea,
 2-ethyl-5-methylhexanamide and 2-ethylpentanamide: three products of
 barbiturate decomposition
;
_journal_coeditor_code           SK3397
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o13
_journal_page_last               o17
_journal_paper_doi               10.1107/S0108270110049322
_journal_volume                  67
_journal_year                    2011
_chemical_formula_iupac          'C8 H17 N O'
_chemical_formula_moiety         'C8 H17 N O'
_chemical_formula_sum            'C8 H17 N O'
_chemical_formula_weight         143.23
_chemical_name_systematic
;
2-ethylpentanamide
;
_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                 111.529(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   21.597(5)
_cell_length_b                   5.0469(12)
_cell_length_c                   18.424(5)
_cell_measurement_reflns_used    2394
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      25.54
_cell_measurement_theta_min      2.84
_cell_volume                     1868.1(8)
_computing_cell_refinement       'APEX2 (Bruker, 2007)'
_computing_data_collection       'APEX2 (Bruker, 2007)'
_computing_data_reduction        'APEX2 (Bruker, 2007)'
_computing_molecular_graphics
;
DIAMOND (Brandenburg & Putz, 1999) and
Mercury (Macrae <i>et al.</i>, 2008)
;
_computing_publication_material
'SHELXTL (Sheldrick, 2008), publCIF (Westrip, 2010) and local programs'
_computing_structure_refinement  'SHELXTL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Bruker APEXII'
_diffrn_measurement_method       'thin-slice \w scans'
_diffrn_radiation_monochromator  'silicon 111'
_diffrn_radiation_source         'Daresbury SRS station 9.8'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.69330
_diffrn_reflns_av_R_equivalents  0.0515
_diffrn_reflns_av_sigmaI/netI    0.0484
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            12823
_diffrn_reflns_theta_full        24.37
_diffrn_reflns_theta_max         24.37
_diffrn_reflns_theta_min         1.98
_exptl_absorpt_coefficient_mu    0.040
_exptl_absorpt_correction_T_max  0.9980
_exptl_absorpt_correction_T_min  0.9921
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.019
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             640
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.169
_refine_diff_density_min         -0.131
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     274
_refine_ls_number_reflns         3250
_refine_ls_number_restraints     19
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.0800
_refine_ls_R_factor_gt           0.0490
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0678P)^2^+0.3705P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1221
_refine_ls_wR_factor_ref         0.1405
_reflns_number_gt                2184
_reflns_number_total             3250
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3397.cif
_cod_data_source_block           III
_cod_original_cell_volume        1868.0(8)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2017950
_cod_database_fobs_code          2017950