With this reaction design in mind, we have studied several different Brønsted acids for the reaction of benzaldehyde acetal 1a with allylsilane 3 to give homoallylic ether 5a (Table [1] ). In initial experiments, acetonitrile was found to be the best solvent. While the modestly acidic diphenyl phosphate) (PPA) gave some conversion (entries 1 and 2), stronger acids such as trifluoroacetic acid (TFA; entries 3 and 4) and in particular sulfonic acids as well as sulfuric acid (entries ...
![[(2,2-Dimethoxyethoxy)methyl]benzene Structure](https://image.chemsrc.com/caspic/360/127657-97-0.png)
