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

Keum SamRok | Zendy; Lee KiBong | Zendy; Kazmaier Peter M. | Zendy; Manderville Richard A. | Zendy; Buncel Erwin | Zendy

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

Author(s) -

Keum SamRok,

Lee KiBong,

Kazmaier Peter M.,

Manderville Richard A.,

Buncel Erwin

Publication year - 1992

Publication title -

magnetic resonance in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0749-1581

DOI - 10.1002/mrc.1260301119

Subject(s) - chemistry , indoline , homonuclear molecule , photochromism , epimer , proton nmr , nuclear magnetic resonance spectroscopy , cyclobutene , nmr spectra database , spectral line , carbon 13 nmr , molecule , stereochemistry , photochemistry , organic chemistry , physics , astronomy , ring (chemistry)

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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