Catalytic Reactions of Pyridines. VI. Heterogeneous Vapor-phase Ring Alkylation of Pyridines with Alcohols over H^+-, Li^+-, and Alkaline Earth Cation-Exchanged Zeolites

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The heterogeneous vapor-phase alkylation of pyridine with methanol was examined over metal cation-exchanged X-and Y-type zeolites in an atmosphere of nitrogen. β-Methylation was observed over H^+-or Li^+-exchanged zeolites, whereas α-and γ-methylation (the former occurred in preference) were observed over alkaline earth cation-exchanged zeolites. For example, at 400℃, the yields of α-, β-, and γ-picolines over the HY catalyst were 2.6,12.2,and 2.6%, whereas those over the BaY catalyst were 22.7,3.8,and 7.6%, respectively. This catalytic ring alkylation over metal cation-exchanged zeolites was also examined by the use of pyridine with ethanol and picolines with either methanol or ethanol.
公益社団法人日本薬学会の論文
1982-07-25