NMR study of the inversion at carbon 2 of some 1′3′3′-trimethylindolino disubstituted spirobenzopyranes
作者:S. Toppet、W. Quintens、G. Smets
DOI:10.1016/0040-4020(75)87058-x
日期:1975.1
The 1H NMR spectra of some 1′3′3′-trimethylindolino-6,8-disubstituted-spirobenzopyranes in equilibrium with more than 5% of their merocyanine isomer were taken at different temperatures in dimethylsulfoxide d6. This presents evidence of a fast inversion process at the asymmetric spiro carbon-2. It is shown that the intermediate responsible for the inversion process is certainly not the merocyanine
在不同温度下,于二甲基亚砜d 6中拍摄了一些1'3'3'-三甲基吲哚基-6,8-二取代-螺并苯并吡喃并与5%以上的花菁异构体平衡的1 H NMR光谱。这提供了在不对称螺碳2处快速转化过程的证据。结果表明,负责转化过程的中间体当然不是花菁,而是螺吡喃的开环顺式异构体。
Effect of substituents in the 5 and 8? positions on the rate of dark decolorization of photocolored solutions of 1,3,3-trimethylspiro[Indoline-2, 2?-[2H-1]benzopyrans]
作者:V. I. Pantsyrnyi、M. A. Gal'bershtam、N. A. Donskaya
DOI:10.1007/bf00480573
日期:1973.5
Dumenil,G. et al., Bulletin de la Societe Chimique de France, 1969, p. 817 - 822