作者:Jürgen Sauer、Peter Bäuerlein、Wolfgang Ebenbeck、Johann Schuster、Ingeborg Sellner、Heinz Sichert、Horst Stimmelmayr
DOI:10.1002/1099-0690(200203)2002:5<791::aid-ejoc791>3.0.co;2-z
日期:2002.3
sequence to give 3,4-diazanorcaradienes 9 with endo configuration of the methyl group at C-7. On gentle heating in inert solvents, these 3,4-diazanorcaradienes 9 are cleanly transformed into semibullvalenes 11. This reaction sequence can also be performed as a one-pot method. Kinetic investigations and comparisons with two model systems are in agreement with the proposed reaction mechanism.
1,2,4,5-四嗪 7 很容易与 3,3'-双环丙烯基 8 在环加成 - 环消除序列中反应,得到 3,4-二氮杂环二烯 9,其 C-7 处的甲基具有内构型。在惰性溶剂中温和加热时,这些 3,4-二氮杂二氮杂环戊二烯 9 会干净地转化为半丁烯二烯 11。该反应顺序也可以作为一锅法进行。动力学研究和与两个模型系统的比较与所提出的反应机理一致。