The synthesis of oligo(2,5‐dialkyl‐p‐phenylene)s bearing terminal boronic acid, bromo‐,acetoxy‐, methoxycarbonyl‐ or carbonic acid groups is reported. Oligomers of number‐average degree of polymerization 6 ≤ Pn ≤ 20 were obtained by the palladium‐catalyzed coupling of aromatic halides with aromatic boronic acids. The same synthetic approach was used to prepare derivatives of p‐terphenyl, bearing hydroxy‐, acetoxy‐, carboxy‐ or amino‐groups in 4,4″‐position.
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Kallitsis et al. (1992) studied this question.