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1H and 13C 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

✍ Scribed by Sam-Rok Keum; Se-Jung Roh; Min-Hyung Lee; Francoise Sauriol; Erwin Buncel

Book ID
102528724
Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
189 KB
Volume
46
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^1^H and ^13^C NMR spectra of the novel heterocyclic Leuco‐TAM dyes, (2__Z__, 2′E)‐2,2′‐(2‐phenyl propane‐1,3‐diylidene) bis(1,3,3‐trimethylindoline) derivatives 1–4 as precursors of triarylmethane (TAM)^+^ (Malachite Green FB‐analog) dyes were completely assigned by 1D 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 FB rings were definitively assigned. The (Z,E) isomers adopt the energetically favored three‐bladed propeller conformation in solution. Copyright © 2008 John Wiley & Sons, Ltd.

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