本文将具有2,5-二芳基呋喃部分的共轭聚合物描述为通过荧光猝灭响应单线态氧(1 O 2)的非共轭侧基。通过将二芳基呋喃氧化成更多的电子贫乏的部分(例如烯醇酯),单线态氧会导致聚(芴-共-亚苯基)共轭的主链将激发的电子捐赠给氧化的侧基,从而导致高达93%的初始荧光猝灭。这种聚合物,而类似的呋喃取代的聚苯撑-亚乙炔基在呋喃-1 O 2反应时没有淬灭反应。所有呋喃衍生物均与1 O 2迅速反应(k = 10 7–10 8 M –1 s –1),与电子贫乏的呋喃相比,电子贫乏的呋喃反应更慢,但荧光猝灭效率更高。
A sequential synthesis of substituted furans from aryl alkynes and ketones involving a cerium(IV) ammonium nitrate (CAN)-mediated oxidative cyclization
作者:Sridhar Undeela、Joshi P. Ramchandra、Rajeev S. Menon
DOI:10.1016/j.tetlet.2014.08.039
日期:2014.10
A convenient, two-step synthesis of substitutedfurans from readily available aryl alkynes and ketones is reported. The furan-forming oxidative cyclization is mediated by the combination of cerium(IV) ammonium nitrate and potassium bromide and can be carried out in an open flask.