土伦氏(Tollens)于1882年发现了银氨络离子能把醛氧化成羧酸,而银离子本身被还原成金属银沉积于洁净的器壁上.故此反应名之曰“银镜反应”。它被认为是区别醛和酮的一个重要反应.氧化醛的银氨络离子称为土伦试剂.土伦试验的函义是说只有醛才与土伦试剂起银镜反应,而酮则不行.这一论点已沿用了一个多世纪.迄今仍为 Tollens discovered in 1882 that silver ammine ions oxidized aldehydes to carboxylic acids, and that silver ions themselves were reduced to metallic silver deposits on the clean walls, so the name of the reaction was called “silver mirror reaction” . It is considered to be an important reaction to distinguish between aldehydes and ketones. The silver ammine complex of the oxidized aldehydes is called the Toranamen. Turen’s test is based on the concept that only aldehydes react with silver ions of Toranum and ketones do not This argument has followed more than a century, so far