The reaction of cyclododecane-1,6- and 1,7-diones with base has resulted in the rapid formation of transannular aldol condensation products. In contrast, sodium ethoxide-catalyzed decomposition of N-nitroso-N-(6-oxocyclododecyl)acetamide and its 7-oxo counterpart in ethanol solution was found to give rise exclusively to unsaturated cyclododecenones. An analysis of these results in terms of the conformational
环十二烷-1,6-和1,7-二酮与碱的反应导致跨环醛醇缩合产物的快速形成。相反,发现
乙醇溶液中
乙醇溶液催化的N-亚硝基-N-(6-氧代
环十二烷基)乙酰胺及其7-氧代对应物的分解仅产生不饱和
环十二碳烯。给出了对这些结果的十二元环系统构象性质的分析,并讨论了观察到的差异的可能原因。