Paper
DITHIOCARBOXYLIERUNGSREAKTIONEN VON cis-BICYCLO[3.3.0]OCTAN-3,7-DIONEN. MOLEKÜL- UND KRISTALLSTRUKTUR VON cis-2,6-BIS(DIMETHYLTHIO-METHYLEN)-BICYCLO[3.3.0]OCTAN-3,7-DION
Published Jun 1, 1996 · W. Dölling, Hans-Martin Siebel, M. Biedermann
Phosphorus Sulfur and Silicon and The Related Elements
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Abstract
Abstract The cis-bicyclo[3.3.0]octane-3,7-dione 1a and its 1,5-dimethyl derivative 1b react with carbon disulfide, strong base and an alkylating agent in dipolar aprotic solvents giving racemic mixtures of 2-dialkylthio-methylene compounds 2, whereas in the presence of two equivalents of carbon disulfide and the appropriate amount of base and further alkylating agent the cis-2,6-bis(dimethylthio-methylene) derivatives 3 are formed. The crystal and molecular structure of 3a has been investigated by X-ray analysis.
The cis-2,6-bis(dimethylthio-methylene)-bicyclo[3.3.0]octan-3,7-dione 3a crystallizes in a tetrahedral configuration, with a tetrahedral
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