The Photochemical Synthesis and Denitrogenation of 8,9-diazadibenzo[c,e]isobullvalene
作者:Ulrich Burger、Yves G. Mentha、Patricia Millasson、Pierre-Andr� Lottaz、Jiri Mareda
DOI:10.1002/hlca.19890720809
日期:1989.12.13
stepwise hydrolytic oxidation of the ensuing triazolidine-dione 2 with nickel peroxide. Thermolysis of 1 in benzene solution is shown to be governed by an initial 1,3-dipolar cycloreversion which leads, via an intermediate diazo compound 11, to cyclobuta[1]phenanthrene 8 and two further carbene-derived C16H12 products. Photolysis of 1 at 350 nm leads in modest yield (12%), via a diazenyl diradical, to an
从二苯并[ a,c ]环辛烯(4)和4-甲基-3 H -1,2,4-三唑-3,5(4 H)-二酮(MTAD)开始,标题偶氮化合物1的应变骨架以串联照片-Diels - Alder加成/di-π-甲烷重排顺序组装。通过用过氧化镍逐步水解随后的三唑烷-二酮2来完成合成。苯溶液中1的热解受最初的1,3-偶极环化反应的控制,该反应通过中间的重氮化合物11导致环丁[ 1]。菲8和另外两个卡宾衍生的C 16 H 12产物。1在350 nm处的光解通过二氮杂烯基双自由基导致适度的产率(12%)导致不稳定的桥联双环丁烷10(dibenzooctavalene)。MNDO计算表明,后者具有C 2对称性的快速反转扭曲结构。