Ketene–Ketene Interconversion. 6-Carbonylcyclohexa-2,4-dienone–Hepta-1,2,4,6-tetraene-1,7-dione–6-Oxocyclohexa-2,4-dienylidene and Wolff Rearrangement to Fulven-6-one
作者:Rainer Koch、Rodney J. Blanch、Curt Wentrup
DOI:10.1021/jo5011087
日期:2014.8.1
4-dienylidene (18). Ketenes 1 and 13 were characterized by IR spectroscopy. Photolysis of matrix-isolated 1 at 254 nm also results in the slow formation of 13. The sequential formation of ketenes 1 and 13 from 7 has also been monitored by FVT-mass spectrometry, and 13 has been trapped with MeOH to afford methyl 1,3-cyclopentadiene-1- and -2-carboxylates 15 and 16. FVT of methyl salicylate-1-13C 7a
通过快速真空热解(FVT)以及水杨酸甲酯(7),2-苯基苯并-1,3-二恶烷-4-酮(8)的Ar矩阵分离生成了6-羰基环己-2,4-二烯酮(1)。 ,邻苯二甲酸过酸酐(9),和苯并呋喃-2,3-二酮(11),并且还通过的矩阵光解9,11 2-diazocyclohepta -4,6-二烯-1,3-二酮(和12)。在每种情况下,高于600°C的FVT都会导致1脱羰,并且沃尔夫重排一致或通过开壳单重态6-氧代环己-2,4-二烯基(18)重排为富尔文6- 1(13)。Ketenes 1和用红外光谱表征了13个。基质分离的1在254 nm处的光解作用还导致13的缓慢形成。乙烯酮1和13从7的顺序形成也已经通过FVT-质谱法进行了监测,并且13已经被MeOH捕获,得到1,3,3-环戊二烯-1-和-2-羧酸甲酯15和16。水杨酸甲酯-1- FVT 13 Ç 7A揭示的深层次的重排13 C标记1A至庚1