Kinetics and Mechanism of Phosphate Photorelease from Benzoin Diethyl Phosphate: Evidence for Adiabatic Fission to an α-Keto Cation in the Triplet State
作者:Cheruvallil S. Rajesh、Richard S. Givens、Jakob Wirz
DOI:10.1021/ja993070i
日期:2000.2.1
The photodissociation of benzoin diethyl phosphate (1, “caged” phosphate) was studied by nanosecond and picosecond laser flash photolysis. The lowest triplet state of 1, 31, was identified as the reactive excited state with an absorption maximum around 340 nm and a lifetime of 10−25 ns, depending on the solvent. Two different reaction paths were identified, both of which involve the release of diethyl
通过纳秒和皮秒激光闪光光解研究了安息香磷酸二乙酯(1,“笼状”磷酸盐)的光解。最低的三重态 1, 31,被确定为反应激发态,吸收最大值约为 340 nm,寿命为 10-25 ns,具体取决于溶剂。确定了两种不同的反应路径,都涉及在 25 ns 内从 31 中释放二乙基磷酸。除了产生 2-苯基苯并呋喃 (2) 和二乙基磷酸的快速环化消除过程之外,31 的异裂绝热离解在水、三氟乙醇和六氟-2-丙醇溶液中产生三线态阳离子和磷酸二乙酯阴离子。三重态阳离子 (570 nm,