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)
- 1 November 1992
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Chemistry
- Vol. 30 (11) , 1128-1131
- https://doi.org/10.1002/mrc.1260301119
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.Keywords
This publication has 16 references indexed in Scilit:
- Photochromie und reversible PhotoisomerisierungPublished by Springer Nature ,2006
- Investigation of the quasi-liquid crystal structureThe Journal of Physical Chemistry, 1985
- Photosensitive monolayers. Studies of surface-active spiropyrans at the air-water interfaceThe Journal of Physical Chemistry, 1984
- Investigation of complex networks of spin-spin coupling by two-dimensional NMRJournal of Magnetic Resonance (1969), 1981
- Kinetic studies on four-coordinate chelate complexes of copper(II): isotopic ligand exchange of bis(salicylaldiminato)copper(II) in tolueneInorganic Chemistry, 1979
- Photo-decoloration Process of the Reverse Photochromic SpiransBulletin of the Chemical Society of Japan, 1972
- PhotochromismPublished by Wiley ,1963
- Photochromic Spiropyrans. I. The Effect of Substituents on the Rate of Ring ClosureJournal of the American Chemical Society, 1959
- Some Thermochromic SpiransJournal of the American Chemical Society, 1952
- Coumarins. I. Derivatives of Coumarin-3- and 4-Carboxylic AcidsJournal of the American Chemical Society, 1949