Generation, Observation, and Free Radical Reactivity of Aliphatic Bisketenes: The Solution to a Long-Standing Problem
作者:Annette D. Allen、Michael H. Fenwick、Amir Jabri、Huzaifa Rangwala、Kazem Saidi、Thomas T. Tidwell
DOI:10.1021/ol016853t
日期:2001.12.1
Bisketenes O=C=CH(CH(2))(n)()CH=C=O (1b,c,d, n = 4, 3, 6) and (E)-O=C=CHCH=CHCH=C=O (E-13) were generated in solution by dehydrochlorination of bis(acyl chlorides) and by photochemical Wolff rearrangements and identified by their characteristic IR signals. The bisketenes react with aminoxyl radicals to give tetraaddition products for 1b and conjugate 1,6-diaddition for E-13.
[反应:参见文本]双烯酮O = C = CH(CH(CH(2))(n)()CH = C = O(1b,c,d,n = 4,3,6)和(E)-O = C = CHCH = CHCH = C = O(E-13)是通过溶液中双(酰氯)的脱氯化氢反应和光化学Wolff重排生成的,并通过其特征IR信号进行鉴定。双烯酮与氨氧基自由基反应,得到1b的四加成产物和E-13的共轭1,6-二加成。