在我们对带有2-(羟基亚氨基)醛(HIA)的刺激响应性聚合物的研究中,我们探索了许多HIA的光化学行为和理化特性。量子力学计算支持实验数据的解释。预期HIA会发生光异构化,螯合金属离子,产生氢键合的二聚体或低聚物,表现出相对较低的p K a s并以> C = NO的形式出现。自由基通过OH氢抽象或肟酸离子的氧化而产生。除了行之有效的E / Z肟的光致异构现象,据我们所知,以前没有文献报道过,我们观察到了Norrish-Yang环化反应生成环丁醇肟。将HIA的酸度,键解离焓和电化学性质与简单肟的文献数据进行了比较。讨论了与HIA的许多潜在应用有关的结果,重点是新型含HIA的响应性聚合物的合成。
Titanium-catalyzed highly stereoselective anti-Markovnikov intermolecular hydroalkoxylation of alkynes to prepare <i>Z</i>-enol ethers
作者:Yang Wang、Biao Ma、Yingning Mao、Zhihui Wang、Jinsong Peng、Chunxia Chen、Zhanyu Li
DOI:10.1039/d3ob01514a
日期:——
Enol ethers are essential synthetic frameworks and widely applied in organic synthesis; however, high regio- and stereo-selective access to enol ethers remains challenging. Herein, we report a titanium-catalyzed stereospecific anti-Markovnikov hydroalkoxylation reaction of alkynes for the synthesis of Z-enol ethers with excellent functional group tolerance and yields. Mechanistic studies showed that
Aldehydes, ketones, esters and lactones are transformed into enol ethers or 1,2-dialkoxy-l-alkenes by treatment with organotitanium species prepared from alkoxymethyl chlorides and a titanocene(II) complex. (C) 2003 Elsevier Ltd. All rights reserved.
Kirby, Anthony J.; O'Carroll, Fiona, Journal of the Chemical Society. Perkin transactions II, 1994, # 4, p. 649 - 656