Vapor Phase Synthesis of Annelated Pyridines over Metal Modified Zeolite Beta

Vapor phase synthesis of annelated pyridines from cyclic ketones, aldehydes and ammonia was carried out over various zeolite molecular sieves like H β , HZSM-5 (240), HZSM-5 (40), HY, HX, HMCM-41 and Mordenite. The preliminary screening of catalyst clearly shows that H β catalyst was found to be more active for the vapor phase synthesis of annelated pyridines. H β was further modified with transition metals like Fe, Cu, Pb, Mo, Zn, Ni, Co, Ce, W and Sn to get higher yields. Graphical Abstract