The reactions of 5-aryl-2,3-dimethylisoxazolium salts with aromatic aldehydes

The reactions of the 3-methyl group in 5-aryl-2,3-dimethylisoxazolium tetrafluoroborates with aromatic aldehydes, in the presence of piperidine were studied. Isoxazolium salt reactivity is independent of the phenyl group substituent at C-5 on the isoxazolium salt ring. However, it does depend on the aldehyde structure.