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Abstract

Described are preferred processes for preparing alkenyl-substituted nitrogenous heterocycles such as vinylpyridines, which comprise reacting a corresponding methyl-substituted heterocycle with a C.sub.1 compound such as formadehyde in the vapor phase over a zeolite catalyst having acidic and basic catalytic sites. The preferred zeolite is a medium-pore zeolite, for example having a constraint index of about 0.5 to about 12. Processes of the invention can be conducted as facile, one-step syntheses utilizing relatively low ratios of alkyl-substituted starting heterocycle (e.g. .alpha.-picoline or .gamma.-picoline) to formaldehyde while nonetheless achieving high selectivities and yields of the corresponding alkenyl compound.

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First Claim