DITHIOCARBOXYLATION REACTIONS OF CIS-BICY CLO[3.3.0]OCTANE-3,7-DIONES- MOLECULAR AND CRYSTAL-STRUCTURE OF ETHYLTHIOMETHYLENE)-BICYCLO[3.3.0]OCTANE-3,7-DIONE
W. Dolling et al., DITHIOCARBOXYLATION REACTIONS OF CIS-BICY CLO[3.3.0]OCTANE-3,7-DIONES- MOLECULAR AND CRYSTAL-STRUCTURE OF ETHYLTHIOMETHYLENE)-BICYCLO[3.3.0]OCTANE-3,7-DIONE, Phosphorus, sulfur and silicon and the related elements, 113(1-4), 1996, pp. 263-274
The cis-bicyclo[3.3.0]octane-3,7-dione 1a and its 1,5-dimethyl derivat
ive 1b react with carbon disulfide, strong base and an alkylating agen
t in dipolar aprotic solvents giving racemic mixtures of 2-dialkylthio
methylene compounds 2, whereas in the presence of two equivalents of c
arbon disulfide and the appropriate amount of basel and further alkyla
ting agent the cis-2,6-bis(dimethylthio-methylene) derivatives 3 are f
ormed. The crystal and molecular structure of 3a has been investigated
by X-ray analysis.