Effect of coordinating ligands on the Pauson-Khand cycloaddition: trapping of an intermediate
作者:Marie E. Krafft、Ian L. Scott、Romulo H. Romero、Sabine Feibelmann、Craig E. Van Pelt
DOI:10.1021/ja00069a017
日期:1993.8
reaction, including reports that tertiary amine N-oxides greatly accelerate the rate of cycloaddition in both intra- and some intermolecular reactions. To date, there has been no direct evidence to support the mechanistic hypothese for either the thermal or amine oxide promoted reactions beyond complete identification of the hexacarbonyl alkyne complex. While the amine oxide promoted reaction is normally
Pauson-Khand 钴介导的环加成反应已成为一种重要的合成反应。一些修改增加了反应的效用,包括有报道称叔胺 N-氧化物大大加快了分子内和一些分子间反应中的环加成速率。迄今为止,除了完全鉴定六羰基炔配合物之外,还没有直接证据支持热或氧化胺促进反应的机械假设。虽然氧化胺促进的反应通常比类似的热反应大大加速,但在氧化胺的存在下,1,6-烯炔的环加成速率可能会因硫、氮或氧的存在而进一步提高同炔基或双炔基位置