Revisit of the Dessy−White Intramolecular Acetylene−Acetylene [2 + 2] Cycloadditions
作者:Chung-Chieh Lee、Man-kit Leung、Gene-Hsiang Lee、Yi-Hung Liu、Shie-Ming Peng
DOI:10.1021/jo061334v
日期:2006.10.1
thermal reactions of 4,4‘-disubstituted 2,2‘-bis(phenylethynyl)biphenyls with 2,3,4,5-tetraphenylcyclopenta-2,4-dienone were carried out under neat conditions and in diphenyl ether at temperatures between 260 and 270 °C to give rise to 9,10,11,12,13,14-hexaphenylcycloocta[l]phenanthrenes as the adducts in 12−23% yields. We traced these results to the intramolecular [2 + 2] thermal cyclization of 2,2‘-b
在该实验中,在纯净的条件下,在4,4'-二取代的2,2'-双(苯基乙炔基)联苯与2,3,4,5-四苯基环戊-2,4-二烯酮中进行了一系列热反应。在260至270°C的温度下生成二苯醚,生成9,10,11,12,13,14-六苯基环八[1]菲作为加合物,收率为12-23%。我们将这些结果追溯到2,2'-双(苯基乙炔基)联苯的分子内[2 + 2]热环化反应以形成1,2-二苯基环丁[1]菲,并进一步被捕获为桥联酮Diels-Alder加合物,然后进行热脱羰基开环,生成了产物。