Synthesis and Properties of 3-Acylmethylene-2-(2-hydroxy-1-alkenyl)-1-phenylcyclopropenes, a New Class of Stabilized Triafulvenes Triavulvenes of type 9 are obtained by reaction of dichloro(phenyl)-cyclopropenylium cation 7 with two equivalents of silyl enol ethers 8. They are characterized by means of their spectroscopic data and by X-ray analysis of 9c as cyclic 7-hydroxy-2,4,6-heptatrien-1-one systems with intramolecular H-bonding (type 10) representing a new type of stabilized methylenecyclopropenes. Similar compounds are formed by reaction of 7 with 4-methoxytoluene and 2-methoxynaphthalene (12, 15) or with dimedone (13). The cyclopropenone 16 is obtained as main product of the 1:1 reaction of 7 and 8a, it isomerizes thermally to give the α-pyrone 17.
3-酰基亚甲基-2-(2-羟基-1-烯基)-1-苯基环
丙烯的合成与性质,一类新型稳定三芳基
乙烯9型三芳基
乙烯通过二
氯(苯基)-环
丙烯阳离子7与两个等效的
硅烯醇醚8反应获得。通过光谱数据和9c的X射线分析,可以确定它们是具有分子内氢键(10型)的7-羟基-2,4,6-庚
三烯-1-酮环状系统,代表了一种新型稳定
亚甲基环丙烯。类似化合物可通过7与4-甲氧基
甲苯和2-甲氧基
萘(12、15)或
二甲酮(13)反应形成。
环丙烯酮16是7和8a以1:1比例反应的主要产物,在热作用下异构化为
α-吡喃酮17。