Photo-and thermo-chromic agents:Mono- and bis-indolinospirobenzopyrans

Abstract

Spiro compounds I [R, R1 = NO2, H(II); H, NO2(III)] were prepared by reaction of 2,3,3-trimethyl-N-(b-hydroxyethyl)indolium iodide with 3- or 5-nitrosalicylaldehyde in the presence of piperidine. To I addition of Ph isocyanate gave monospiro isomers IV [R, R1 = NO2, H(V); H, NO2(VI)] and addition of toluene-2,4-diisocyanate gave VII. II, V, and VII are photochromic compounds, while III and VI are thermochromic compounds

Key words: INDOLE P, ETHANOL, BENZOPYRAN P, SPIRO COMPOUNDS, PIPERIDINE, PHOTOCHROMISM, THERMOCHROMISM

CLC Number:

O621

Cite this article

LIU RUILAN;WANG DAQI;ZHAO FUZHONG;DENG FUXI;YANG HAITAO. Photo-and thermo-chromic agents:Mono- and bis-indolinospirobenzopyrans[J]. Chin. J. Org. Chem., 1987, 7(2): 123-127.

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