Illumination (λ > 325 mµ) of the ene-1,4-diones (Ia)—(Ie) in the presence of olefins and acetylenes gives derivatives of tetracyclo [8,2,1,02,9, 04,7] tridecane [e.g., (II)]. The reaction appears to involve an electrophilic 3(ππ*) state of the enedione which adds to the olefin via a transition state resembling the most stable biradical intermediate.
照明烯-1,4-二酮(Ia)的(λ> 325毫微米) -烯烃和
炔烃的存在(IE)给出的四环衍
生物〔8,2,1,0 2,9,0 4,7 ]
十三烷[例如,(II)]。该反应似乎涉及烯二酮的亲电子3(ππ *)状态,该状态通过类似于最稳定的双自由基中间体的过渡态加到烯烃中。