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 ‐B Lee, Peter M. Kazmaier, Richard A. Manderville, Erwin Buncel

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    47 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 languageEnglish
    Pages (from-to)1128-1131
    Number of pages4
    JournalMagnetic Resonance in Chemistry
    Volume30
    Issue number11
    DOIs
    Publication statusPublished - 1992 Nov

    Keywords

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

    ASJC Scopus subject areas

    • General Chemistry
    • General Materials Science

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