Azine-Hydrazone Tautomerism of Guanylhydrazones: Evidence for the Preference Toward the Azine Tautomer.
Chourasiya, Sumit S.; Kathuria, Deepika; Nikam, Sampada S.; Ramakrishnan, Ashok; Khullar, Sadhika; Mandal, Sanjay K.; Chakraborti, Asit K.; Bharatam, Prasad V.; The Journal of organic chemistry 81 (2016) 7574–7583; doi:10.1021/acs.joc.6b01258

data_4037012
_publ_section_title
;
 Azine-Hydrazone Tautomerism of Guanylhydrazones: Evidence for the
 Preference Toward the Azine Tautomer.
;
_journal_issue                   17
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              7574
_journal_page_last               7583
_journal_paper_doi               10.1021/acs.joc.6b01258
_journal_volume                  81
_journal_year                    2016
_chemical_formula_moiety         'C19 H22 N4 O3, C H4 O'
_chemical_formula_sum            'C20 H26 N4 O4'
_chemical_formula_weight         386.45
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                104.87(2)
_cell_angle_beta                 101.59(3)
_cell_angle_gamma                111.32(3)
_cell_formula_units_Z            2
_cell_length_a                   8.887(17)
_cell_length_b                   10.048(19)
_cell_length_c                   12.94(2)
_cell_measurement_reflns_used    3381
_cell_measurement_temperature    296.(2)
_cell_measurement_theta_max      24.9845
_cell_measurement_theta_min      2.3212
_cell_volume                     983(3)
_computing_cell_refinement       'SAINT V8.27B (Bruker AXS Inc., 2012)'
_computing_data_collection       'APEX2 (Bruker)'
_computing_data_reduction        'SAINT V8.27B (Bruker AXS Inc., 2012)'
_computing_molecular_graphics    'SHELXTL (Bruker AXS)'
_computing_publication_material  'SHELXTL (Bruker AXS)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296.(2)
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker Kappa APEX II'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0760
_diffrn_reflns_av_sigmaI/netI    0.0684
_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       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            11768
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.72
_diffrn_source                   'sealed tube'
_diffrn_source_type              'fine focus'
_exptl_absorpt_coefficient_mu    0.092
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.4932
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2012/1 (Bruker AXS Inc.)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.305
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rectangle
_exptl_crystal_F_000             412
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.752
_refine_diff_density_min         -0.439
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.992
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     258
_refine_ls_number_reflns         3463
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.992
_refine_ls_R_factor_all          0.1017
_refine_ls_R_factor_gt           0.0820
_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^)+(0.1688P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2138
_refine_ls_wR_factor_ref         0.2318
_reflns_number_gt                2460
_reflns_number_total             3463
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo6b01258_si_002.cif
_cod_data_source_block           14
_cod_original_cell_volume        983.(3)
_cod_database_code               4037012