Expansion of the pentafluorobenzene ring of perfluoro-1,2-diethyl-1-phenylbenzocyclobutene under the action of SbF 5

Abstract

Perfluoro-1,2-diethyl-1-phenylbenzocyclobutene under the action of SbF 5 gives, after treatment of the reaction mixture with water, perfluoro-4-[1-(6-propyl-phenyl)-propylidene]cyclohexa-2,5-dienone along with the products of unusual pentafluorobenzene ring expansion – perfluorinated 4 b,10-diethylbenzo[ a]azulen-7(4 bH)-one and 10-ethylbenzo[ a]azulen-6(10 H)-one.