dienophiles triazolinedione, singlet oxygen and in part tetracyanoethylene cyclo-add to bicyclo[2.1.0]pent-2-ene (1) across the central σ-bond to give bicyclo[2.2.1]heptene-type adducts, while the dipoles phenyl azide, benzonitrile oxide and diphenyldiazomethane cyclo-add at the π-bond with expected stereochemistry.
亲双烯体三唑啉二酮,单线态氧和部分四
氰基亚乙基环通过中心σ键加至双环[2.1.0]戊-2-烯(1),得到双环[2.2.1]庚烯型加合物,而偶极子苯
叠氮化物,氧化
苯甲腈和
二苯基重氮甲烷在π键上环加,且具有预期的立体
化学。