3,6 -二甲氧基- 1 H ^ -环丙[ b ]萘图4是得自1,4-苯醌在27-28%总产率四个步骤。二醚4提供了由二甲硅烷基化合物14的方式的范围亚甲基衍生物15A-E的,并且被有效地由铈(IV)铵脱甲基化,以提供1个ħ -cyclopropa [ b ]萘-3,6 -二酮16(85 %)报告其晶体结构。醌16是第一个稳定的环丙基醌,但它不易转化为1-C外环烯烃。描述了化合物的化学性质,讨论了其光谱数据,并提供了16的循环伏安法。
Methylidenecycloproparenes: Novel Compounds with Fascinating Properties
作者:Brian Halton、Peter Stang
DOI:10.1055/s-1997-723
日期:1997.2
Proton abstraction from the methylene position of a cycloproparene provides the corresponding C1 anion that can be intercepted by a carbonyl-containing compound to provide a wide range of novel methylidenecycloproparenes. The physical and chemical aspects of this comparatively new class of surprisingly stable, strained compounds have been explored. The present account provides a perspective on these developments from the initial experiments in the Utah laboratories.
Synthetic protocols, molecular polarity, and 13C NMR correlations for 1-aryl- and 1-diarylmethylidene-1H-cyclopropa[b]naphthalenes
作者:Brian Halton、Gareth M. Dixon
DOI:10.1039/b411714j
日期:——
The Peterson olefination for alkylidenecycloproparene synthesis from a 1,1-disilylcycloproparene has been refined into five distinct protocols that have provided 43 new aryl- (5 and 6) and diaryl- (7 and 8), and aryl(phenyl)- (9 and 10) methylidene derivatives. The permanent dipole moments of these and other previously reported compounds have been measured and the direction of the dipole, to or from