Patent ID: 6538139
Filing Date: 2003-03-25
Classification: B01J,C07D

Abstract:
A process for the preparation of pyrroles of the formula (I) by dehydrogenating pyrrolidines of the formula (II) whereR1 and R2, independently of one another, are hydrogen or an aliphatic radical of 1 to 6 carbon atoms, or of pyridines of the formula (III) by dehydrogenating piperidines of the formula (IV) whereR3, R4 and R5, independently of one another, are hydrogen or an aliphatic radical of 1 to 6 carbon atoms, in the presence of a supported noble metal catalyst, wherein the dehydrogenation is carried out in the presence of from 1 to 50% by weight, based on the pyrrolidine or piperidine and water, of water.