Substituent Effects on the Reactions of Diarylgermylenes and Tetraaryldigermenes with Acetic Acid and Other Lewis Bases in Hydrocarbon Solution
作者:Lawrence A. Huck、William J. Leigh
DOI:10.1021/om0609362
日期:2007.3.1
A series of three 1,1-diaryl-3,4-dimethylgermacyclopent-3-ene derivatives bearing polar substituents in the para-positions of the 1,1-diphenyl rings have been synthesized, and their photochemistry has been studied by steady state and laser flash photolysis methods. Photolysis in hydrocarbon solvents affords the corresponding diarylgermylenes in chemical and quantum yields similar to those of the parent
合成了一系列三个在1,1-二苯环对位带有极性取代基的1,1,1-二芳基-3,4-二甲基锗环戊-3-烯衍生物,并通过稳态对它们的光化学进行了研究。激光闪光光解方法。在烃类溶剂中进行光解可得到与母体(1,1-二苯基)化合物相似的化学和量子产率的相应二芳基亚锗烯,如甲醇(MeOH)和乙酸(HOAc)的捕集实验结果所示。与亚甲基二苯锗烷(GePh 2)相似,亚二甲基苯具有紫外/可见吸收光谱(λmax = 480-500 nm)和动力学行为(τ≈2μs)),在己烷溶液中。它们的衰减导致形成新的瞬态产物,该瞬态产物分配给相应的四芳基二聚体(Ge 2 Ar 4),其吸收光谱(λmax = 440 nm)和寿命也与母体Ge 2 Ph 4相似。通过添加HOAc和Et 2快速消灭亚二甲苯和相应的二锗烯NH,其速率常数随芳基取代基的吸电子能力的增加而增加,这与在所有情况下涉及初始对锗的亲核攻击的反应机理一致。还