在Diels-Alder反应中一种新的二烯──1─(2-丁二烯基)吡啶溴化物

1-(2-Butadiemyl)pyjidinium Bromidea Novel Diene in Diels-Alder Reaction

１－（３－二无氧化硫杂环戊－３－烯基）吡啶溴化物（４）作为新的带正电荷的二烯（６）的稳定的前体，它与一些缺电子的亲双烯体发生［４＋２］环加成反应。

Sulfolenyl)pyridinium bromide(4) Serves as the stable precursor for a novel , positively charged diene 6 which underges [4+ 2]cyloadditions with a number of electron -poor dienophiles