The irradiation of acetylacetone in the presence of oct-1-ene, cyclopentene, cyclohexene, and 1-methylcyclohexene gives substituted heptandiones. These diketones may then be cyclized with acid or base. Irradiation of isopropenyl acetate and acetylacetone gives, after cyclization, m-5-xylenol. The mechanism of the reaction is discussed: it represents the first cycloaddition to an isolated ethylenic
在辛-1-烯、
环戊烯、
环己烯和1-甲基
环己烯存在下,
乙酰丙酮的辐照得到取代的
庚二酮。这些二酮然后可以用酸或碱环化。
乙酸异丙烯酯和
乙酰丙酮的辐照在环化后得到间-5-二甲
苯酚。讨论了反应机理:它代表了对分离的烯键的第一次环加成。