Phosphorus containing mixed anhydrides—their preparation, labile behaviour and potential routes to their stabilisation
作者:Jacorien Coetzee、Graham R. Eastham、Alexandra M. Z. Slawin、David J. Cole-Hamilton
DOI:10.1039/c2ob07164a
日期:——
Simple mixed anhydrides are known to pose synthetic difficulties relating to their thermal lability and ways to stabilise such mixed anhydride systems by relying on either electronic or steric effects were therefore explored. Thus, a series of acyloxyphosphines and acylphosphites derived from either propanoic acid or phenylacetic acid were prepared and their in solution stability assessed. These compounds were, where stability allowed, fully characterised using standard analytical techniques. NMR studies, in particular, unearthed interesting coupling behaviour for a number of the acyloxyphosphines and acylphosphites as well as their rearrangement products which could be linked to their chiral nature. Furthermore, the crystal structures for three of the prepared mixed anhydrides were determined using X-ray crystallography and are reported herein.
简单的混合酸酐因其热不稳定性而在合成上存在困难,因此探索了通过电子或立体效应来稳定这种混合酸酐体系的方法。因此,制备了一系列来源于丙酸或苯乙酸的酰氧基膦和酰基膦酸酯,并评估了它们在溶液中的稳定性。在稳定性允许的情况下,使用标准分析技术对这些化合物进行了全面表征。特别是在核磁共振(NMR)研究中,发现了一些酰氧基膦和酰基膦酸酯及其重排产物的有趣耦合行为,这可能与它们的手性特性有关。此外,利用X射线晶体学确定了三种制备的混合酸酐的晶体结构,并在此报告。