Electrochemical reduction of bicyclo[3,3,1]nonadienediones: synthesis of substituted barbaralanes
作者:John M. Mellor、B. Stanley Pons、John H. A. Stibbard
DOI:10.1039/p19810003092
日期:——
Electrochemical reduction of 4,8-dimethylbicyclo[3.3.1]nona-3,7-diene-2,6-dione in the first cathodic wave at –2.0 V gave dihydro-dimer products. In contrast, reduction in the second cathodic wave at –2.75 V in the presence of acetic anhydride gave a substituted barbaralane, 2,6-diacetoxy-4,8-dimethyltricyclo[3.3.1.02,8]nona-3,6-diene. Similarly by reduction of 4,6-dimethylbicyclo[3.3.1]nona-4,6-diene-2
在–2.0 V的第一个阴极波中将4,8-二甲基双环[3.3.1] nona-3,7-diene-2,6-dione进行电化学还原,得到二氢二聚体产物。相反,在乙酸酐存在下在–2.75 V下第二个阴极波的还原得到了一个取代的Barbaralane,2,6-二乙酰氧基-4,8-二甲基三环[3.3.1.0 2,8 ] nona-3,6-diene 。类似地,在第二波中以–2.75 V还原4,6-二甲基双环[3.3.1] nona-4,6-二烯-2,8-二酮,进一步取代了Barbaralane,4,6-diacetoxy-2,8得到-二甲基三环[3.3.1.0 2,8 ]壬娜-3,6-二烯。讨论了取代基对barbaralanes价异构体稳定性的影响。基于循环伏安法和计时电流法获得的数据,对电化学还原的机理进行了分析。