dimer of the anion (). The reaction can be partly suppressed with 1,4-dinitrobenzene(p-DNB) and the radical intermediate can be trapped by diallyl ether (DAE) to give the tetrahydrofuran derivatives. Anions of acetylacetone and malonitrile react also with in the presence of DAE to yield the five-membered ring compounds. All these results seem to indicate that the reaction is a radical chain process
氟代烷基
碘化物XCF 2 CF 2 I(X = ClCF 2 CF 2,Cl(CF 2)4)()与
DMF中的
乙酰乙酸乙酯()阴离子容易反应生成()XCF 2 CF 2 H() ,(CH 3 CO)2 CHCO 2 Et()和阴离子的二聚体()。该反应可以用1,4-
二硝基苯(p-DNB)部分抑制,自由基中间体可以被二
烯丙基醚(
DAE)捕获,得到
四氢呋喃衍
生物。
乙酰丙酮和
丙二腈的阴离子也会与在
DAE的存在下产生五元环化合物。所有这些结果似乎表明该反应是由电子转移引起的自由基链过程。在XCF 2 CF 2 I(X = Cl,I)的情况下,生成
四氟乙烯和,而不是和,表明在引发步骤中发生了2-卤代四
氟乙基的β片段化。