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_7051812
_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_moiety         'C23 H20 O2'
_chemical_formula_sum            'C23 H20 O2'
_chemical_formula_weight         328.39
_chemical_name_systematic
;
1,3-diphenyl-2-(1-phenylethyl)propane-1,3-dione
;
_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   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            8
_cell_length_a                   16.9980(2)
_cell_length_b                   9.9242(3)
_cell_length_c                   21.5231(5)
_cell_measurement_reflns_used    5398
_cell_measurement_temperature    295
_cell_measurement_theta_max      27.00
_cell_measurement_theta_min      3.68
_cell_volume                     3630.77(14)
_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    'ORTEPIII (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., 1999)'
_diffrn_ambient_temperature      295
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_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  0.0229
_diffrn_reflns_av_sigmaI/netI    0.0334
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            7329
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         3.68
_exptl_absorpt_coefficient_mu    0.075
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.202
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             1392
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.203
_refine_diff_density_min         -0.184
_refine_diff_density_rms         0.036
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.013
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     306
_refine_ls_number_reflns         3938
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.013
_refine_ls_R_factor_all          0.0776
_refine_ls_R_factor_gt           0.0491
_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^)+(0.0604P)^2^+0.8406P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1184
_refine_ls_wR_factor_ref         0.1354
_reflns_number_gt                2709
_reflns_number_total             3938
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b714708b.txt
_cod_data_source_block           (4)
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      'P bca'
_cod_database_code               7051812