Abstract
Perkin up: The scope and limitations of 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) with methanesulfonic acid as a cyclizing system for the formation of polycyclic arenecarboxylates from esters of Perkin condensation products is examined. Thiophene-based systems are particularly versatile and form products that include annelated pleiadiene.
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