H-1 and C-13 NMR assignments for new heterocyclic TAM leuco dyes, (2Z,2 ' E)-2,2 '-(2-phenyl propane-1,3-diylidene) bis(1,3,3-trimethylindoline) derivatives. Part II

摘要

The H-1 and 13 C NMR spectra of the novel heterocyclic Leuco-TAIVI dyes, (2Z, 2'E)-2,2'-(2-phenyl propane-1,3-diylidene) bis(1,3,3trimethylindoline) derivatives 1 -4 as precursors of triarylmethane l (Malachite Green FB-analog) dyes were completely assigned by 1 D and 2D NMR experiments, including DEPT, COSY, HSQC, HMBC, and NOESY. Especially, the diastereotopic gem-dimethyl protons at the C3 and C3' positions of the Ill rings were definitively assigned. The (Z,E) isomers adopt the energetically favored three-bladed propeller conformation in solution. Copyright (c) 2008 John Wiley & Sons, Ltd.