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Catalyst

Acetaldehyde is reacted with ammonia in the gas phase over an aluminium oxide catalyst, the main products are 2 and 4-picoline (methyl pyridine) plus various byproducts. The products are isolated by fractional distillation.

Industrial Organic Chemistry, 3rd. Ed. K. Weissermel, H.-J. Arpe, VCH (1997)

Reaction defined as:
Condensation
Cyclisation
Industrial Process: Organic