Influence of Substituents on the Through-Space Shielding of Aromatic Rings
Colin W. Anson; Dasan M. Thamattoor; Journal of Organic Chemistry 77 (2012) 1693–1700; doi:10.1021/jo202203r

data_4026952
_publ_section_title
;
 Influence of Substituents on the Through-Space Shielding of Aromatic
 Rings
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              1693
_journal_page_last               1700
_journal_paper_doi               10.1021/jo202203r
_journal_volume                  77
_journal_year                    2012
_chemical_formula_moiety         'C18 H16 O'
_chemical_formula_sum            'C18 H16 O'
_chemical_formula_weight         248.31
_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                   8.2230(14)
_cell_length_b                   8.9887(15)
_cell_length_c                   17.940(3)
_cell_measurement_reflns_used    3205
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      26.34
_cell_measurement_theta_min      2.53
_cell_volume                     1326.0(4)
_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      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0336
_diffrn_reflns_av_sigmaI/netI    0.0314
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            10781
_diffrn_reflns_theta_full        26.42
_diffrn_reflns_theta_max         26.42
_diffrn_reflns_theta_min         2.27
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_T_max  0.9903
_exptl_absorpt_correction_T_min  0.9741
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'Sheldrick, G.M., (2008) SADABS University of Gottingen, Germany'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.244
_exptl_crystal_description       'triangular prism'
_exptl_crystal_F_000             528
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.176
_refine_diff_density_min         -0.129
_refine_diff_density_rms         0.035
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.7(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     174
_refine_ls_number_reflns         2724
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0432
_refine_ls_R_factor_gt           0.0373
_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^)+(0.0380P)^2^+0.1784P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0831
_refine_ls_wR_factor_ref         0.0858
_reflns_number_gt                2473
_reflns_number_total             2724
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo202203r_si_007.cif
_cod_data_source_block           das0916_0m
_cod_database_code               4026952