The reaction of ketene with N-oxides of eight sorts of pyridine and quinoline homologs, such as 4-picoline 1-oxide (I), 3-picoline 1-oxide (II), 2, 6-lutidine 1-oxide (III), 4-nitropyridine 1-oxide (IV), 4-nitro-2-picoline 1-oxide (V), 4-nitro-2, 6-lutidine 1-oxide (VI), quinaldine 1-oxide (VII) and, lepidine 1-oxide (VIII) has been investigated. Though (II), (IV) and, (V) were recovered unreacted, (I), (III) and, (VI) afforded the corresponding alcoholic and phenolic products, respectively.This reaction was considered to proceed similary to that with acetic anhydride and deoxygenated products have been obtained in each reaction.None of the phenolic derivatives were produced from the reaction of (VII), which afforded only alcoholic derivatives such as 2-quinolinemethanol and α, α′-bis (2-quinolinemethanol) (IX), however, (VIII) gave only phenolic products of 3-hydroxylepidine.