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Thermo- and photochromic dyes: Spiro(indolinebenzopyrans). 2—detailed assignment of the 1H NMR spectra and structural aspects of the closed form of 1,3,3-trimethylspiro(indoline-2,2′-benzopyrans)

✍ Scribed by Sam-Rok Keum; Ki-Bong Lee; Peter M. Kazmaier; Richard A. Manderville; Erwin Buncel

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
344 KB
Volume
30
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The proton NMR assignments for a series of 12 thermo‐ and photochromic 1,3,3‐trimethylspiro(indoline‐2,2′‐benzopyrans) dyes is reported. All of the protons in the dye molecule were assigned through a combination of homonuclear decoupling experiments and correlation spectroscopy. The relative stereochemistry of the indolino gem‐dimethyl groups was assigned so that, for the S‐epimer, the pro‐R methyl was found to resonate at 1.24 ppm while the pro‐S methyl appeared at 1.37 ppm for compound 1.

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