A New Iterative Approach for the Synthesis of Oligo(phenyleneethynediyl) Derivatives and Its Application for the Preparation of Fullerene?Oligo(phenyleneethynediyl) Conjugates as Active Photovoltaic Materials
to give the centrosymmetrical OPE pentamer 20 (Scheme 5). Subsequent reduction followed by reaction of the resulting diol 21 with acid 22 under esterification conditions led to bis-malonate 23. Oxidative coupling of terminal alkyne 14 with the Hay catalyst gave bis-aldehyde 24 (Scheme 6). Treatment with diisobutylaluminium hydride followed by dicylcohexylcarbodiimide-mediated esterification with acid