The reaction products of the picolyl radicals at high temperature were characterized by mass-selective threshold photoelectron spectroscopy in the gas phase. Aminomethylpyridines were pyrolyzed to initially produce picolyl radicals (m/z=92). At higher temperatures further thermal reaction products are generated in the pyrolysis reactor. All compounds were identified by mass-selected threshold photoelectron
通过气相质量选择阈值光电子能谱对吡啶甲基自由基在高温下的反应产物进行了表征。氨甲基吡啶热解最初产生吡啶自由基(m/z=92)。在较高温度下,在热解反应器中进一步产生热反应产物。所有化合物均通过质量选择阈值光电子能谱进行鉴定,并对几种迄今尚未探索的反应分子进行了表征。计算中概述了几种解离途径的机制。m/z=91 的光谱,由吡啶甲基氢损失产生,显示四种异构体,两种乙炔基吡咯,其绝热电离能 (IEad ) 为 7.99 eV (2-乙炔基-1H-吡咯) 和 8.12 eV (3-乙炔基-) 1H-吡咯)和两种环戊二烯甲腈,IE 分别为 9.14 eV(环戊-1,3-二烯-1-甲腈)和 9.25 eV(环戊-1,4-二烯-1-甲腈)。第二个连续的氢损失形成氰基环戊二烯基自由基,IE 为 9.07 eV (T0) 和 9.21 eV (S1)。该化合物进一步解离为乙炔和氰基丙炔基(IE=9.35 e
1-Methoxycarbonylpyrrolizin-3-one and related compounds
作者:Xavier L. M. Despinoy、Hamish McNab
DOI:10.1039/b901961h
日期:——
Flash vacuum pyrolysis (FVP) of dimethyl E- or Z-pyrrol-2-ylbut-2-enedioate 5 at 700 °C gave 1-methoxycarbonylpyrrolizin-3-one 1. The sequence involves E- to Z-isomerisation (if necessary), elimination of methanol and cyclisation; the elimination step is rate determining. The pyrrolizinone 1 is stable at low temperatures, but at room temperature dimerises spontaneously across the 1,2-bond to give a
Selectfluor-Induced Oxidative Amination of N-Heteroaromatics with Purine
作者:Haiyan Cao、Gary Histand、Dongen Lin
DOI:10.1021/acs.joc.3c00149
日期:2023.5.5
An oxidative coupling reaction between purines and aromatic N-heterocycles was developed to synthesize a series of N-heteroaryl purine derivatives using Selectfluor as an oxidant at room temperature. This process uses a commercial oxidant, uses no base, metal, or other additives, is simple to carry out, and has a broad range of substrates.