Abstract
Spirocyclopropyl ketones (XIV), obtained from the photolysis of t-butyl-p-quinones (I;R1= H or But), rearrange to (III) and (IV) and add nitriles and ketones in competitive 1,4- and 1,5-dipolar cycloadditions giving 6- and 7-membered heterocyclic compounds (VII)–(XII).

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