Flash vacuum pyrolysis of 1,2-benzoisothiazole 1,1-dioxides. Benzoxazole and benzonitrile formation
Abstract
Flash vacuum pyrolysis of 3-aryl-1,2-benzoisothiazole 1,1-dioxides gives mainly 2-arylbenzoxazoles and some benzonitriles, while 3-alkyl-1,2-benzoisothiazole 1,1-dioxides yield principally o-cyanophenol; the 3-t-butyl compound gave both benzonitrile and o-cyanophenol by preliminary fragmentation to simpler benzoisothiazole 1,1-dioxides.