α-取代β-二酮类化合物光化学行为的研究

A Study on the Photochemical Behaviors of α-Substituted β-Diketone

合成了四种不同α-取代的β-二酮化合物,对它们的光物理和光化学行为进行了研究.发现单取代的三种化合物在溶液中基本上以酮式结构存在,但在光照下转变成较稳定的烯醇结构,因此具有良好的光稳定能力.然而,双取代的化合物在光照下发生α-裂解及其他反应,并具有一定的光敏化能力.

Four kinds of α-substituted β-diketone were synthesized and their photophysical and photochemical behaviors have been studied carefully. It was found that the ketostructure was presented mainly in the solution of mono-substituted diketones. But it can be converted to a stable enol-form under irradiation. Therefore, it could be used as a good stabilizer. For the di-substituted β-diketone, however, an α-cleavage reaction was observed when it was irradiated by light. In addition, it possesses a certain abillty in the process of photosensitisation.