Hydrogen Tunneling Avoided: Enol-Formation From a Charge-tagged Phenyl Pyruvic Acid Derivative Evidenced by Tandem-MS, IR Ion Spectroscopy and Theory
Paul, Mathias; Peckelsen, Katrin; Thomulka, Thomas; Neudoerfl, Joerg; Martens, Jonathan; Berden, Giel; Oomens, Jos; Berkessel, Albrecht; Meijer, Anthony J. H. M.; Schäfer, Mathias; Physical Chemistry Chemical Physics  (2019) –; doi:10.1039/C9CP02316J

data_7233072
_publ_section_title
;
 Hydrogen Tunneling Avoided: Enol-Formation From a Charge-tagged Phenyl
 Pyruvic Acid Derivative Evidenced by Tandem-MS, IR Ion Spectroscopy and
 Theory
;
_journal_name_full               'Physical Chemistry Chemical Physics'
_journal_paper_doi               10.1039/C9CP02316J
_journal_year                    2019
_chemical_formula_moiety         'C11 H13 N O3, C9 H11 N O'
_chemical_formula_sum            'C20 H24 N2 O4'
_chemical_formula_weight         356.41
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2019-06-14 deposited with the CCDC.    2019-07-10 downloaded from the CCDC.
;
_cell_angle_alpha                78.7640(10)
_cell_angle_beta                 75.9780(10)
_cell_angle_gamma                67.1630(10)
_cell_formula_units_Z            2
_cell_length_a                   8.6578(3)
_cell_length_b                   10.0035(4)
_cell_length_c                   11.6371(4)
_cell_measurement_reflns_used    13387
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      72.152
_cell_measurement_theta_min      3.940
_cell_volume                     895.44(6)
_computing_cell_refinement       'Bruker APEX 3'
_computing_data_collection       'Bruker APEX 3'
_computing_data_reduction        'Bruker APEX 3'
_computing_molecular_graphics    'SCHAKAL99 (E. Keller 1999)'
_computing_publication_material  'PLATON (A. L. Spek 1980-2015)'
_computing_structure_refinement
;
SHELXL-2014/7 (Sheldrick, 2014)
SHELXLE (C. B. Huebschle 2016)'
;
_computing_structure_solution    'SHELXT  (Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device_type  'Bruker D8'
_diffrn_measurement_method       'phi / omega scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0290
_diffrn_reflns_av_unetI/netI     0.0288
_diffrn_reflns_Laue_measured_fraction_full 0.988
_diffrn_reflns_Laue_measured_fraction_max 0.983
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            13387
_diffrn_reflns_point_group_measured_fraction_full 0.988
_diffrn_reflns_point_group_measured_fraction_max 0.983
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         72.152
_diffrn_reflns_theta_min         3.940
_diffrn_source                   'micro focus'
_exptl_absorpt_coefficient_mu    0.754
_exptl_absorpt_correction_T_max  0.7536
_exptl_absorpt_correction_T_min  0.6285
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.322
_exptl_crystal_description       prism
_exptl_crystal_F_000             380
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.070
_exptl_crystal_size_min          0.030
_refine_diff_density_max         0.292
_refine_diff_density_min         -0.240
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.106
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         3476
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.106
_refine_ls_R_factor_all          0.0476
_refine_ls_R_factor_gt           0.0440
_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^)+(0.0529P)^2^+0.6405P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1248
_refine_ls_wR_factor_ref         0.1273
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3173
_reflns_number_total             3476
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9cp02316j2.cif
_cod_data_source_block           map343n_0ma_a
_cod_database_code               7233072
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.864
_shelx_estimated_absorpt_t_max   0.978
_shelx_res_checksum              4463