Reaction of benz[a]azulene with dimethyl acetylenedicarboxylate. Formation of a π-bond fixed heptalene derivative
作者:Masafumi Yasunami、Toshio Sato、Masaaki Yoshifuji
DOI:10.1016/0040-4039(94)02176-c
日期:1995.1
Reaction of benz[a]azulene with dimethyl acetylenedicarboxylate (DMAD) in tetralin at 200 °C gave a new π-electron system, dimethyl benzo[a]heptalene-6,7-dicarboxylate and dimethyl indenol[1,2,3-cd]azulene-5,6-dicarboxylate. The reaction of a non-fused azulene, 6-isopropyl-1-phenylazulene, gave extremely different results indicating strong effects of the fused benzene ring on the reactivities of azulenes
苯并[a] ul烯与乙炔二羧酸二甲酯(DMAD)在四氢化萘中在200°C下反应,得到一个新的π电子体系,苯并[a]庚二烯-6,7-二羧酸二甲酯和二甲基茚满[1,2,3-cd ] azulene-5,6-二羧酸酯。非稠合的氮杂6-异丙基-1-苯基氮杂的反应给出了截然不同的结果,表明稠合的苯环对天青石与DMAD的反应性有很强的影响。七元环上质子的耦合常数和庚烯的可变温度1 H NMR表明该分子的π键固定。