Deacetalization by photoinduced electron transfer with a pyrylium salt: Effect of limiting the amounts of water, oxygen and sensitizer
作者:Pablo Gavina、Natividad López Lavernia、Ramón Mestres、Miguel A. Miranda
DOI:10.1016/0040-4020(96)00162-7
日期:1996.3
water or oxygen and the amount of photosensitizer. The results are justified through generation of the radical cation 1+·, followed by ring opening and trapping of the radical/cationic sites by oxygen or water. The delocalized 1,3-radical cations III and the ozonides IV appear to be involved as key intermediates. Formation of n-nonanal as a minor product is explained through cleavage of the C2-nonyl
研究了使用2,4,6-三苯基四氟硼酸钾(TPT)作为敏化剂对4-(对异丙基苯基)-2-壬基-1,3-二氧戊环1进行光脱缩醛化,以探索实现缓慢的阳光控制释放的可能性聚合物结合的羰基官能化的化学信息合成。已经发现该反应主要产生正癸醛和对异丙基苯甲醛,以及较少量的相应酸。转化程度和产物分布取决于水或氧气的存在以及光敏剂的量。通过生成自由基阳离子1 +·可以证明结果是正确的。,然后开环并用氧气或水捕获自由基/阳离子位点。离域的1,3-自由基阳离子III和臭氧化物IV似乎是关键的中间体。通过裂解1 +·的C 2-壬基键解释了作为次要产物正壬醛的形成。