In tetraenic propellane imides substituted at the imide nitrogen atom by relatively large groups both syn and anti-attack occurs when N-phenyltriazolinedione is used as dienophile. However, in formation of the mono-Diels-Alder adducts the unsubstituted cyclohexadiene ring is the one attacked and the bromocyclohexadiene ring is attacked only later, during formation of bis-adducts.
在将N-
苯基三唑啉二
酮用作亲二
烯物时,在
酰亚胺氮原子上被较大的基团取代的四
烯丙基丙二
酰亚胺中,反式和反式均会发生。然而,在单-Diels-Alder加合物的形成中,未取代的环
己二烯环是一个被攻击的,而
溴环
己二烯环仅在后来形成双-加合物的过程中被攻击。