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The acid catalyzed ring closure of an appropriately substituted phenyl ketoester sulfide served as the initial reaction in the synthesis of several 3,4‐ and 3,6‐disubstituted benzo[b]thiophenes. One of these compounds, 4‐methoxybenzo[b]thienyl‐3‐acetic acid, showed marked plant growth enhancement.
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Schuetz et al. (1967) studied this question.
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