Treatment of n-butanal with ammonium acetate in acetic acid gave 3,5-diethyl-2,3-dihydro-2-n-propyl-pyridine, or, by oxidation, 3,5-diethyl-2-n-propylpyridine; similarly, acetaldehyde on oxidation gave 2-picoline.
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Charman et al. (1971) studied this question.