Process for the preparation of pyridines.

摘要

Pyridines of the formula (I) where the individual radicals R1 may be identical or different and are each hydrogen or an aliphatic radical are prepared by reacting a) a 2-alkoxy-2,3-dihydro-4H-pyran of the formula (II) or b) a glutaraldehyde of the formula (III) where R1 has the abovementioned meansings and R2 is an aliphatic radical, with ammonia in the presence of an acidic, solid catalyst.