Oligo[p-phenylene-(E)-vinylene]benzoic acids of up to four aromatic units are synthesized in complete oligo- and excellent (E)-stereo-control via an iterative modified Ramberg–Bäcklund reaction; these extended π-systems can be used to construct oligo [p-phenylene(E)-vinylene]s in good yields.
T. Chan, H. Chow, S. Fong, M. Leung and J. Tu, J. Chem. Soc., Chem. Commun., 1994, 1919 DOI: 10.1039/C39940001919
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