ELECTRON-ACCEPTING DIBENZOTHIOPHENE 5,5-DIOXIDES

摘要

1443450 Dibenzothiophene derivatives OCEVAN DER GRINTEN NV 14 Sept 1973 [15 Sept 1972] 28918/74 Divided out of 1443449 Heading C2C Novel dibenzothiophene derivatives having the general formula wherein R and RSP111/SP are hydrogen or nitro; RSP1/SP and RSP11/SP are bromine, nitro or cyano and pSP11/SP is zero or one, provided that RSP1/SP and RSP11/SP cannot both be nitro when R and RSP111/SP are both hydrogen, are prepared by oxidizing dibenzothiophene with a mixture of sulphuric acid and dichromate, and optionally nitrating the product. The novel compounds are useful as electron acceptors.