Can a C-H...O Interaction Be a Determinant of Conformation?
Christopher R. Jones; Pranjal K. Baruah; Amber L. Thompson; Steve Scheiner; Martin D. Smith; Journal of the American Chemical Society 134 (2012) 12064–12071; doi:10.1021/ja301318a

data_4118281
_publ_contact_author             'Martin D. Smith'
_publ_contact_author_email       martin.smith@chem.ox.ac.uk
_publ_contact_author_fax         '+44 1865 285002'
_publ_contact_author_phone       '+44 1865 285103'
_publ_section_title
;
 Can a C-H...O Interaction Be a Determinant of Conformation?
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12064
_journal_page_last               12071
_journal_paper_doi               10.1021/ja301318a
_journal_volume                  134
_journal_year                    2012
_chemical_absolute_configuration
;
 1144 Friedel pairs were averaged for the refinement
;
_chemical_formula_moiety         'C15 H24 F4 N2 O4, C5'
_chemical_formula_sum            'C20 H24 F4 N2 O4'
_chemical_formula_weight         432.41
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 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                   5.5639(2)
_cell_length_b                   16.0755(5)
_cell_length_c                   26.6196(9)
_cell_measurement_reflns_used    18325
_cell_measurement_temperature    300(2)
_cell_measurement_theta_max      22.46
_cell_measurement_theta_min      1.02
_cell_volume                     2380.92(14)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius B.V. 1998)'
_computing_data_reduction
;
 HKL Denzo and Scalepack (Otwinowski & Minor 1997)
;
_computing_publication_material  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_solution    'SIR-92 (Altomare et al. 1994)'
_diffrn_ambient_temperature      300(2)
_diffrn_measured_fraction_theta_full 0.955
_diffrn_measured_fraction_theta_max 0.955
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'Thin slice \w and \f scans'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0433
_diffrn_reflns_av_sigmaI/netI    0.0314
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            7565
_diffrn_reflns_theta_full        22.52
_diffrn_reflns_theta_max         22.52
_diffrn_reflns_theta_min         3.74
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  0.981
_exptl_absorpt_correction_T_min  0.785
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 multi-scan from symmetry-related measurements 
 Sortav (Blessing 1995)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.206
_exptl_crystal_description       block
_exptl_crystal_F_000             904
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.277
_refine_diff_density_min         -0.176
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   2(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.118
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         1751
_refine_ls_number_restraints     8
_refine_ls_restrained_S_all      1.120
_refine_ls_R_factor_all          0.0905
_refine_ls_R_factor_gt           0.0833
_refine_ls_shift/su_max          0.013
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1741P)^2^+0.6533P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2438
_refine_ls_wR_factor_ref         0.2538
_reflns_number_gt                1556
_reflns_number_total             1751
_reflns_threshold_expression     >2sigma(I)
_oxford_structure_analysis_title ms0812
_cod_data_source_file            ja301318a_si_002_2.cif
_cod_data_source_block           3
_cod_database_code               4118281