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)

Sam‐Rok ‐R Keum; Ki Bong Lee; Peter M. Kazmaier; Richard A. Manderville; Erwin Buncel

doi:10.1002/mrc.1260301119

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)

Sam‐Rok ‐R Keum, Ki Bong Lee, Peter M. Kazmaier, Richard A. Manderville, Erwin Buncel

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1128-1131
Number of pages	4
Journal	Magnetic Resonance in Chemistry
Volume	30
Issue number	11
DOIs	https://doi.org/10.1002/mrc.1260301119
Publication status	Published - 1992

Keywords

H NMR assignments
Spiro(indoline‐2,2′‐benzopyrans)
Thermo‐ and photochromic dyes

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)

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10.1002/mrc.1260301119

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Keum, SR. R., Lee, K. B., Kazmaier, P. M., Manderville, R. A., & Buncel, E. (1992). 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). Magnetic Resonance in Chemistry, 30(11), 1128-1131. https://doi.org/10.1002/mrc.1260301119

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). / Keum, Sam‐Rok ‐R; Lee, Ki Bong; Kazmaier, Peter M. et al.
In: Magnetic Resonance in Chemistry, Vol. 30, No. 11, 1992, p. 1128-1131.

Research output: Contribution to journal › Article › peer-review

Keum, SRR, Lee, KB, Kazmaier, PM, Manderville, RA & Buncel, E 1992, '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)', Magnetic Resonance in Chemistry, vol. 30, no. 11, pp. 1128-1131. https://doi.org/10.1002/mrc.1260301119

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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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