The first report on a phosphonium salt as an asymmetric catalyst was published in 1997, and thereafter this area of research remained fairly dormant for almost a decade. However, the second decade (2007–2017) has recorded a significant growth in the published literature and it has now emerged as a hot topic of research. The use of phosphonium salts as a phase-transfer catalyst has gained momentum in recent years due to their ease of availability and simple preparation technique. Most of these asymmetric phosphonium salts are derived from readily available starting materials like chiral amino acids and binaphthyl rings. With a simple modification in the basic core of these moieties, they can be used to execute a number of enantioselective organic transformations. This review presents a comprehensive overview of the historical development of catalyst design, with its necessary modification and applications in selective organic transformations.

中文翻译：

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不对称催化中的os盐：十年广泛研究工作中的一个旅程

关于a盐作为不对称催化剂的第一份报告发表于1997年，此后近十年来该研究领域一直处于休眠状态。然而，第二个十年（2007-2017年）在已出版的文献中记录了显着的增长，现在已经成为研究的热门话题。由于phospho盐的易获得性和简单的制备技术，近年来将momentum盐用作相转移催化剂的势头强劲。这些不对称phospho盐中的大多数都来自容易获得的原料，例如手性氨基酸和联萘环。通过对这些部分的基本核心进行简单的修改，就可以将它们用于执行许多对映选择性有机转化。