Peptoid Atropisomers
Bishwajit Paul; Glenn L. Butterfoss; Mikki G. Boswell; P. Douglas Renfrew; Fanny G. Yeung; Neel H. Shah; Christian Wolf; Richard Bonneau; Kent Kirshenbaum; Journal of the American Chemical Society 133 (2011) 10910–10919; doi:10.1021/ja2028684

data_4106408
_publ_section_title
;
 Peptoid Atropisomers
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10910
_journal_page_last               10919
_journal_paper_doi               10.1021/ja2028684
_journal_volume                  133
_journal_year                    2011
_chemical_formula_moiety         'C19 H20 N2 O4'
_chemical_formula_sum            'C19 H20 N2 O4'
_chemical_formula_weight         340.37
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   10.5493(15)
_cell_length_b                   16.050(2)
_cell_length_c                   20.088(3)
_cell_measurement_reflns_used    9900
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.99
_cell_measurement_theta_min      2.54
_cell_volume                     3401.2(8)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w 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  0.0639
_diffrn_reflns_av_sigmaI/netI    0.0495
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            54143
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.03
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.9934
_exptl_absorpt_correction_T_min  0.9527
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.329
_exptl_crystal_description       plate
_exptl_crystal_F_000             1440
_exptl_crystal_size_max          0.52
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.230
_refine_diff_density_min         -0.286
_refine_diff_density_rms         0.056
_refine_ls_extinction_coef       0.0043(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.151
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     234
_refine_ls_number_reflns         3334
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.151
_refine_ls_R_factor_all          0.0911
_refine_ls_R_factor_gt           0.0675
_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^)+(0.0151P)^2^+8.9344P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1556
_refine_ls_wR_factor_ref         0.1623
_reflns_number_gt                2389
_reflns_number_total             3334
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja2028684_si_004.cif
_cod_data_source_block           10ktk5h
_cod_original_cell_volume        3401.4(8)
_cod_database_code               4106408