TY - JOUR
T1 - Thermo‐ and photochromic dyes
T2 - 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)
AU - Keum, Sam‐Rok ‐R
AU - Lee, Ki Bong
AU - Kazmaier, Peter M.
AU - Manderville, Richard A.
AU - Buncel, Erwin
PY - 1992
Y1 - 1992
N2 - 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.
AB - 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.
KW - H NMR assignments
KW - Spiro(indoline‐2,2′‐benzopyrans)
KW - Thermo‐ and photochromic dyes
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U2 - 10.1002/mrc.1260301119
DO - 10.1002/mrc.1260301119
M3 - Article
AN - SCOPUS:84989060647
SN - 0030-4921
VL - 30
SP - 1128
EP - 1131
JO - Organic Magnetic Resonance
JF - Organic Magnetic Resonance
IS - 11
ER -