Thermal fragmentation of 1-substituted spiro[adamantane-2,2′-adamantane] derivatives
作者:John S. Lomas、Christine Cordier、Sylvette Briand
DOI:10.1039/p29960000865
日期:——
3-(2-adamantyl)bicyclo[3.3.1]nova-2,6- and -2,7-dienes, 4, and 2-(3-noradamantyl)-2,4-dehydroadamantane, 7. At low conversion 3 and 7 are the major products, while one isomer of 4, the 2,6-diene, predominates in the equilibrium mixture. Pd/C-catalysed hydrogenation of the dienes in ethanol gives first 3-(2-adamantyl)bicyclo[3.3.1]non-2-ene, 5, and then endo-3-(2-adamantyl)bicyclo[3.3.1]nonane, 6.
1-羟基-或1-乙酰氧基[1]二金刚烷的热解得到3-(金刚烷)-双环[3.3.1]非6-烯,3,3-(2-金刚烷基)双环[3.3.1]的混合物nova-2,6-和-2,7-二烯4和2-(3-noradamantyl)-2,4-dehydroadamantane,7。低转化率时3和7是主要产物,而4的一种异构体2,6-二烯在平衡混合物中占主导地位。Pd / C催化二乙醇在乙醇中的加氢反应,首先得到3-(2-金刚烷基)双环[3.3.1] non-2-ene,5,然后是内-3-(2-金刚烷基)双环[3.3.1]壬烷,6。在这些条件下,烃7不被氢化;加热后转化为3和4(2,6)的混合物。讨论了1- [1]二金刚烷碳正离子断裂的机理。虽然1,4-氢化物的移位可能有助于[1]双金刚烷体系的反应,但分子力学计算表明,可以由1-羟基螺环[金刚烷-2,9'-双环[3.3.1]]容易地形成烯烃。 [壬烷]最好用涉及双环壬烷体系的椅-艇构象的1