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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 103 (1972), S. 1253-1261 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Es wird gezeigt, daß Aniline, die in 2-bzw. 2,6-Stellung halogensubstituiert sind, mit Phenalentrion (PT) in Xylol oder Eisessig zu den entsprechenden 7H,8H-Naphtho[1,8−bc]-phenoxazin-7-on-derivaten reagieren. Die analoge Umsetzung mit 2,6-Dimethyl-bzw. 2,6-Diäthyl-anilin in Xylol führt zu Oxazepinen, während in Eisessig bevorzugt Addition des zur NH2-Gruppe in p-Stellung befindlichen H-Atoms an die mittelständige C=O-Gruppe desPT stattfindet. Es wird experimentell bewiesen, daß diese Ringschlußreaktion über primär gebildete Halbaminale abläuft.
    Notes: Abstract o-Halogenated (o,o′-dihalogenated) anilines react with phenalenetrione (PT) in boiling xylene or acetic acid to give 7H,8H-naphtho[1.8−bc]phenoxazin-7-one derivatives. The analogous reaction with 2.6-dimethyl-or 2.6-diethyl-aniline in xylene gives oxazepines, while in acetic acid preferential addition of the aniline with the para position to the NH2-group to the central C=O-group ofPT occurs. It can be shown, that the first step in the ring closure reaction is the formation of semiaminales.
    Type of Medium: Electronic Resource
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