reduction dominantly occurs over the acetylene reduction. The produced bis(radical anion) intermediate undergoes a synchronous double-radical 5-endo-dig cyclization. This simple reduction procedure produces two intriguing classes of ladder π-conjugated skeletons, i.e., emissive methylene-bridged stilbenes and dibenzo[a,e]pentalenes regarded as a cyclic 1,4-diphenylbutadiene.
用
萘二
甲酸锂处理双(芳基羰基)
二苯基乙炔时,羰基还原反应主要发生在
乙炔还原反应之上。产生的双(自由基阴离子)中间体经历同步的双自由基5-内切-挖掘环化。这种简单的还原过程产生了两个有趣的梯形π共轭骨架,即被认为是环状1,4-二苯基
丁二烯的亚甲基桥联发光
苯乙烯和二苯并[ a,e ]
戊烯。