BEDT-TTF AND RELATED DONOR MOLECULES - MADE EASY

Two new general approaches to TTF-based donor molecules have been deve loped. Route A gave, after basic cleavage of thiapendione (1) and dire ct alkylation of intermediate (2), the corresponding 4,5-disubstituted 1,3-dithiol-2-ones of general formula 4 as exemplified in Schemes 1 a nd 2. The more versatile route B involves isolation of the unstable in termediate 2 as chelate complex 3, which then gives upon treatment wit h alkyl/acyl halides compounds of type 4. Compounds (4) can either be coupled/cross-coupled in triethyl phosphite in known manner to give sy mmetric/asymmetric donors molecules or be used as precursors for the p reparation of other sulfur containing heterocycles or metal complexes. Versatility, yields and high purity of intermediates and final produc ts offer an interesting alternative to literature procedures.