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Steric buttresses1-4 can be used to enhance certain Diels-Alder cycloaddition reactions.Triphenylchloromethane(trityl chloride)is bulky enough to be used as a steric buttress to perform intra-molecular Diels-Alder cycloaddition reactions involving a furan ring system,reactions which otherwise do not occur.Three tritylated Diels-Alder cycloadducts were successfully made by reactions of their respective N-alkenylfurfurylamine with trityl chloride followed by heating under reflux with toluene.