Abstract
1. Bromination of 5-alkyl(methoxy)thieno[3,2-d]isothiazoles with bromine or N-bromosuccinimide affords high yields of 4-bromo-5-alkyl(methoxy)thieno-[3,2-d]isothiazoles. 2. In the reaction of butyllithium with 5-substituted thieno[3,2-d]isothiazoles, the principal reaction is cleavage of the isothiazole ring to give the corresponding 2-butylthio-3-thiophenealdehydes.
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