Photochemical Formation and Chemistry of Long-Lived Adamantylidene-Quinone Methides and 2-Adamantyl Cations
作者:Nikola Basarić、Ivana Žabčić、Kata Mlinarić-Majerski、Peter Wan
DOI:10.1021/jo902004n
日期:2010.1.1
addition products (e.g., Φ for methanolysis of 8 is 0.55). In addition, the zwitterionic 9QM undergoes an unexpected rearrangement involving transformation of the 2-phenyl-2-adamantyl cation into the 4-phenyl-2-adamantyl cation (Φ ∼ 0.03). An analogous rearrangement was observed with methoxy derivatives 9a and 10a. Zwitterionic 9QM was characterized by LFP in 2,2,2-trifluoroethanol (τ = 1 μs). In TFE, in
Hydroxymethylphenols策略性地取代的2-羟基-2-金刚烷基部分,ADPH 8 - 10,合成,和它们的光化学反应性进行了研究。在激发到单重激发态时,AdPh 8经历分子内质子转移,伴随着H 2 O的损失,产生了甲基醌8QM。通过激光闪光光解法(CH 3 CN-H 2 O 1:1,τ= 0.55 s)和紫外可见光谱检测到了8QM的存在。H 2 O脱水存在下AdPh 9和10的单重激发态,得到9QM和10QM。光化学形成的QM被亲核试剂捕获,得到加成产物(例如,甲醇裂解8的Φ为0.55)。此外,两性离子9QM发生意想不到的重排,涉及将2-苯基-2-金刚烷基阳离子转变为4-苯基-2-金刚烷基阳离子(Φ〜0.03)。观察到与甲氧基衍生物9a和10a类似的重排。两性离子9QM的特征在于LFP在2,2,2-三氟乙醇中(τ= 1μs)。在TFE中,处于基态的AdPh 10与10QM处于平衡状态,这允许记录1