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An Improved Rapid Synthesis of Oligo(p-benzamide) Block Copolymers

✍ Scribed by Hannah M. König; Andreas F. M. Kilbinger

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
454 KB
Volume
29
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

We describe a new synthesis that allows the preparation of oligo(p‐benzamide)s up to the heptamer on solid support without the need of semi‐temporary amide N‐protective groups. With increase in length, the solubility of oligo(p‐benzamide)s reduces dramatically. Even the tetra(p‐benzamide) is not soluble in common organic solvents. Therefore, solution syntheses of oligomers beyond the tetramer are not feasible. As will be shown in this paper, solid supported synthesis allows the preparation of even longer oligomers (up to the heptamer) in good yields. The high dilution on the solid support is most likely responsible for their pseudo‐solution‐like reactivity and the prevention of aggregation. This procedure is a significant improvement of previous syntheses and an important tool for the rapid exploration of supramolecular rod–coil copolymers based on oligoaramides.

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