Formation of a Tunneling Product in the Photorearrangement of <i>o</i>
-Nitrobenzaldehyde
作者:Dennis Gerbig、Peter R. Schreiner
DOI:10.1002/anie.201705140
日期:2017.8.1
The photochemical rearrangement of o‐nitrobenzaldehyde to o‐nitrosobenzoic acid, first reported in 1901, has been shown to proceed via a distinct ketene intermediate. In the course of matrix isolation experiments in various host materials at temperatures as low as 3 K, the ketene was re‐investigated in its electronic and vibrational ground states. It was shown that hitherto unreported H‐tunneling dominates
1901年首次报道,邻硝基苯甲醛向邻硝基亚硝基苯甲酸的光化学重排是通过独特的乙烯酮中间体进行的。在温度低至3 K的各种基质材料中进行基质分离实验的过程中,对烯酮的电子和振动基态进行了重新研究。结果表明,迄今未报道的H隧道效应以其半衰期为几分钟主导了其反应活性。出乎意料的是,隧道产品不同于o在光过程中形成的亚硝基苯甲酸:通过辐射制备后,乙烯酮通过H隧穿引发的有趣机制自发地重排为异恶唑酮。CCSD(T)/ cc-pVTZ计算结果表明,在实验条件下,该异恶唑酮在热力学和动力学上均不受青睐,这种独特的隧穿产物的形成构成了隧穿控制的一个杰出且新的例子。