Tautomerization in naphthalenediimines: a keto-enamine Schiff base macrocycle.
Gallant, Amanda J.; Yun, Michael; Sauer, Marc; Yeung, Charles S.; MacLachlan, Mark J.; Organic letters 7 (2005) 4827–4830; doi:10.1021/ol051511z

data_1506686
_publ_section_title
;
 Tautomerization in naphthalenediimines: a keto-enamine Schiff base
 macrocycle.
;
_journal_issue                   22
_journal_name_full               'Organic letters'
_journal_page_first              4827
_journal_page_last               4830
_journal_paper_doi               10.1021/ol051511z
_journal_volume                  7
_journal_year                    2005
_chemical_formula_sum            'C26 H22 N2 O4'
_chemical_formula_weight         426.46
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 103.823(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.649(5)
_cell_length_b                   7.4767(16)
_cell_length_c                   23.829(8)
_cell_measurement_reflns_used    22536
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      23.881
_cell_measurement_theta_min      2.8195
_cell_volume                     2015.3(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0456
_diffrn_reflns_av_sigmaI/netI    0.0435
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            21437
_diffrn_reflns_theta_full        25.05
_diffrn_reflns_theta_max         25.05
_diffrn_reflns_theta_min         1.76
_exptl_absorpt_coefficient_mu    0.096
_exptl_absorpt_correction_T_max  0.976
_exptl_absorpt_correction_T_min  0.861
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.406
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             896
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.161
_refine_diff_density_min         -0.204
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.990
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     377
_refine_ls_number_reflns         3569
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.990
_refine_ls_R_factor_all          0.0765
_refine_ls_R_factor_gt           0.0385
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0558P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0857
_refine_ls_wR_factor_ref         0.0995
_reflns_number_gt                2319
_reflns_number_total             3569
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol051511zsi20050628_064610.cif
_cod_data_source_block           mm030
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               1506686