Substituent effects on keto–enol tautomerization of β-diketones from X-ray structural data and DFT calculations
Bertolasi, Valerio; Ferretti, Valeria; Gilli, Paola; Yao, Xiaoquan; Li, Chao-Jun; New Journal of Chemistry 32 (2008) 694–; doi:10.1039/b714708b

data_7051809
_publ_section_title
;
 Substituent effects on keto--enol tautomerization of \b-diketones from
 X-ray structural data and DFT calculations
;
_journal_issue                   4
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              694
_journal_paper_doi               10.1039/b714708b
_journal_volume                  32
_journal_year                    2008
_chemical_formula_sum            'C13 H15 Cl O2'
_chemical_formula_weight         238.70
_chemical_name_systematic
;
3-[1-(4-chlorophenyl)ethyl]pentane-2,4-dione
;
_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   difmap
_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                   5.3281(2)
_cell_length_b                   8.3677(3)
_cell_length_c                   28.9434(13)
_cell_measurement_reflns_used    1651
_cell_measurement_temperature    295
_cell_measurement_theta_max      26.00
_cell_measurement_theta_min      2.53
_cell_volume                     1290.41(9)
_computing_cell_refinement       'Denzo SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1998)'
_computing_data_reduction        'Denzo SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEP III (Burnett & Johnson, 1996)'
_computing_publication_material
;
SHELXL-97 (Sheldrick, 1997), PARST (Nardelli, 1995)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare et al., 1997)'
_diffrn_ambient_temperature      295
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       '\f scans 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  0.0620
_diffrn_reflns_av_sigmaI/netI    0.0560
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            7896
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         2.53
_exptl_absorpt_coefficient_mu    0.280
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.229
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             504
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.140
_refine_diff_density_min         -0.223
_refine_diff_density_rms         0.042
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.40(12)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     172
_refine_ls_number_reflns         2459
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.0995
_refine_ls_R_factor_gt           0.0516
_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^)+(0.0750P)^2^+0.0189P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1183
_refine_ls_wR_factor_ref         0.1411
_reflns_number_gt                1484
_reflns_number_total             2459
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            b714708b.txt
_cod_data_source_block           (1)
_cod_database_code               7051809