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3,5-Dibromo-1,2,4-trithia-3,5-diborolane reacts with alkynes to give ⊿ 4 -2-bromo-1,3,2- dithiaborolenes. As a by-product in the reaction to form ⊿ 4 -2-bromo-4-phenyl-1,3,2-dithiaborolene the ⊿ 2,5 -4-bromo-2,6-diphenyl-l,4-thiaboracyclohexadiene is formed. Vinyltrimethylsilane reacts with 3,5-dimethyl-1,2,4-trithia-3,5-diborolane to yield the 2-methyl-4- trimethylsilyl-1,3,2-dithiaborolane. The bromine atom in these compounds can be substituted by lithium alkyls, by secondary as well as lithiated primary amines or by lithiohexamethyldisilazane. Starting from ⊿ 4 -2-&lt;-butylamino-4-phenyl-1,3,2-dithiaborolene and heterocycles containing boron bromine functions, diborylamines are obtained. Isocyanates and di-i-propylcarbodiimide, respectively, react with 3,5-dimethyl-1,2,4-trithia-3,5-diborolane by formation of 5-methyl-1,4-dithia-2-azacyclopentanethiones(3) or of -pentanones(3). 3,5-Dimethyl-1,2,4-trithia-3,5-diborolane reacts with o-acetylaminophenole to give 3-acetyl-2-methyi-4,5-benzo-l-oxa-3-aza-2-boracyclopentane.  1 H,  11 B,  13 C NMR, mass and IR spectra are reported.

zeitschrift für naturforschung b

Reaktionen von Mehrfachbindungssystemen mit dem 1.2.4-Trithia-3.5-diborolan-Ring / Reactions of Multiple Bond Systems with the 1,2,4-Trithia-3.5-diborolane Ring