Abstract
Syntheses of trienones 2 and 3 and their Diels-Alder reactions with dimethyl acetylenedicarboxylate and benzoquinone are described. The ketone and methyl groups in trienones 2 and 3 appear to be repulsive factors controlling π facial selectivity in their Diels-Alder reactions. Large amounts of exo adducts are formed in the benzoquinone reactions.
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