Pyridinium p-toluenesulfonate
Pyridinium p-toluenesulfonate is a salt of pyridine and p-toluenesulfonic acid. It is a colourless solid.Uses
In organic synthesis, PPTS is used as a weakly acidic catalyst, providing an organic soluble source of pyridinium ions. For example, PPTS is used to deprotect silyl ethers or tetrahydropyranyl ethers when a substrate is unstable to stronger acid catalysts. It is also a commonly used catalyst for the preparation of acetals and ketals from aldehydes and ketones.
