Noncovalent Interactions of Fluorine with Amide and CH<sub>2</sub> Groups in N-Phenyl γ-Lactams: Covalently Identical Fluorine Atoms in Nonequivalent Chemical Environments.
Xi, Ning; Sun, Xiaohua; Li, Minxiong; Sun, Mingming; Xi, Michael A.; Zhan, Zeping; Yao, Jia; Bai, Xu; Wu, Yanjun; Liao, Min; The Journal of organic chemistry 83 (2018) 11586–11594; doi:10.1021/acs.joc.8b01562

data_4035286
_publ_section_title
;
 Noncovalent Interactions of Fluorine with Amide and CH<sub>2</sub> Groups
 in N-Phenyl \g-Lactams: Covalently Identical Fluorine Atoms in
 Nonequivalent Chemical Environments.
;
_journal_issue                   19
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              11586
_journal_page_last               11594
_journal_paper_doi               10.1021/acs.joc.8b01562
_journal_volume                  83
_journal_year                    2018
_chemical_absolute_configuration ad
_chemical_formula_sum            'C11 H9 F2 N O3'
_chemical_formula_weight         241.19
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21 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                 99.157(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.9994(3)
_cell_length_b                   10.6106(5)
_cell_length_c                   7.0797(3)
_cell_measurement_reflns_used    2398
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      66.5450
_cell_measurement_theta_min      6.3180
_cell_volume                     519.09(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 10.5058
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Xcalibur, Atlas, Gemini ultra'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0293
_diffrn_reflns_av_sigmaI/netI    0.0287
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            4091
_diffrn_reflns_theta_full        67.14
_diffrn_reflns_theta_max         67.14
_diffrn_reflns_theta_min         6.33
_exptl_absorpt_coefficient_mu    1.185
_exptl_absorpt_correction_T_max  0.7975
_exptl_absorpt_correction_T_min  0.7175
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.543
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             248
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.165
_refine_diff_density_min         -0.156
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.11(15)
_refine_ls_extinction_coef       0.0145(16)
_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   1.066
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     156
_refine_ls_number_reflns         1749
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.066
_refine_ls_R_factor_all          0.0328
_refine_ls_R_factor_gt           0.0309
_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^)+(0.0450P)^2^+0.0685P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0767
_refine_ls_wR_factor_ref         0.0784
_reflns_number_gt                1673
_reflns_number_total             1749
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo8b01562_si_001.cif
_cod_data_source_block           Compound_R-3
_cod_database_code               4035286