作者:Jelena Veljković、Lidija Uzelac、Krešimir Molčanov、Kata Mlinarić-Majerski、Marijeta Kralj、Peter Wan、Nikola Basarić
DOI:10.1021/jo3002479
日期:2012.5.18
Five new (2-adamantyl)naphthol derivatives (5–9, quinone methide precursors, QMP) were synthesized and their photochemical reactivity was investigated by preparative photolyses, fluorescence spectroscopy, and laser flash photolysis (LFP). Excitation of QMP 5 to S1 leads to efficient excited state intramolecular proton transfer (ESIPT) coupled with dehydration, giving quinone methide QM5 which was characterized
五个新的(2-金刚烷基)萘酚衍生物(5 - 9,醌甲基化物的前体,QMP)的合成和它们的光化学反应性通过制备photolyses,荧光光谱,和激光闪光光解(LFP)研究。将QMP 5激发至S 1会导致有效的激发态分子内质子转移(ESIPT)和脱水,从而得到以LFP(在CH 3 CN–H 2 O中,λmax = 370 nm,τ= 0.19 )表征的甲基苯醌QM5。小姐)。QMP 5在CH 3 OH–H 2中的辐照O(4:1),甲醇分解的量子产率为Φ= 0.70。萘酚的激发QMP 6 - 8至S 1在CH 3 CN导致光电离和形成naphthoxyl自由基。在质子溶剂,QMP 6 - 8经历溶剂辅助PT给予QM6或两性离子QM8与亲核试剂递送加合物反应,但具有较低的显著量子效率。质子溶剂中的QMP 9经历了两个竞争过程,即通过QM9进行光解和与溶剂辅助的PT结合到萘的碳原子上,从而产生两性离子。QM9LFP的特征是(在CH