Thieno [3,4‐b] pyridine (5) was synthesized by means of the successive steps of (a) photochlorination of 2,3‐dimethylpyridine to the bis(chloromethyl) compound, (b) condensation with sodium sulfide, (c) oxidation to the sulfoxide, and (d) catalytic dehydration by means of alumina. Thieno[3,4‐c]pyridine (6) was obtained in an analogous manner. Spectral properties indicate that 5 and 6 have aromatic character.
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Klemm et al. (1972) studied this question.
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