Bi-functionalization of silica spheres with sulfonic and carboxylic groups via a co-condensation route

Oligo(ether-sulfones), 2. Synthesis of a

Oligo(ether-sulfones), 2. Synthesis of a novel macrocyclic aromatic ether sulfone bearing two carboxylic groups and the corresponding polyamide via direct condensation of the macrocycle with 4,4′-diaminodiphenylmethane

✍ Barbara Rodewald; Helmut Ritter 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 470 KB

## Abstract A new macrocyclic arylene ether sulfone bearing two carboxylic groups, 4, was prepared by use of pseudo high dilution techniques. In a first step, 4,4‐bis[4‐(4‐(4‐chlorophenylsulfonyl)phenoxy)phenyl]pentanoic acid (3) was prepared from bis(4‐chlorophenyl)sulfone (1) and an excess of 4,4