Keto-Enol Thermodynamics of Breslow Intermediates.
Paul, Mathias; Breugst, Martin; Neudörfl, Jörg-Martin; Sunoj, Raghavan B.; Berkessel, Albrecht; Journal of the American Chemical Society 138 (2016) 5044–5051; doi:10.1021/jacs.5b13236

data_4130047
_publ_section_title
;
 Keto-Enol Thermodynamics of Breslow Intermediates.
;
_journal_issue                   15
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5044
_journal_page_last               5051
_journal_paper_doi               10.1021/jacs.5b13236
_journal_volume                  138
_journal_year                    2016
_chemical_formula_moiety         'C22 H20 N2 O'
_chemical_formula_sum            'C22 H20 N2 O'
_chemical_formula_weight         328.40
_space_group_crystal_system      orthorhombic
_space_group_IT_number           29
_space_group_name_Hall           'P 2c -2ac'
_space_group_name_H-M_alt        'P c a 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   22.245(2)
_cell_length_b                   9.3234(9)
_cell_length_c                   8.4228(8)
_cell_measurement_temperature    100(2)
_cell_volume                     1746.9(3)
_computing_cell_refinement       'Nonius DENZO (Otwinowski, Minor 1997)'
_computing_data_collection       'Nonius COLLECT'
_computing_data_reduction        'Nonius DENZO (Otwinowski, Minor 1997)'
_computing_molecular_graphics    'SCHAKAL99 (E. Keller 1999)'
_computing_publication_material  'PLATON (A. L. Spek 1980-2015)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS97  (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       'Phi-omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0625
_diffrn_reflns_av_unetI/netI     0.1530
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -28
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            6691
_diffrn_reflns_point_group_measured_fraction_full 0.952
_diffrn_reflns_point_group_measured_fraction_max 0.949
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.994
_diffrn_reflns_theta_min         2.369
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    0.077
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.249
_exptl_crystal_description       platelet
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.200
_exptl_crystal_size_min          0.030
_refine_diff_density_max         0.168
_refine_diff_density_min         -0.202
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details
;
 Flack x determined using 566 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.2(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.818
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     226
_refine_ls_number_reflns         3616
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.818
_refine_ls_R_factor_all          0.1319
_refine_ls_R_factor_gt           0.0456
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0198P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0673
_refine_ls_wR_factor_ref         0.0837
_reflns_Friedel_coverage         0.780
_reflns_Friedel_fraction_full    0.900
_reflns_Friedel_fraction_max     0.895
_reflns_number_gt                1825
_reflns_number_total             3616
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja5b13236_si_001.cif
_cod_data_source_block           map47
_cod_database_code               4130047
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.985
_shelx_estimated_absorpt_t_max   0.998
_shelx_res_checksum              38607
_shelx_hkl_checksum              63106