Crown ether-oligo-oxyethylene

Polymer-bound catalysts containing both quaternary ammonium centres and oligo-(oxyethylene) links of the type shown in Scheme 1.10 have been synthesized [34]. There is an increase in catalytic activity resulting from a cooperative effect of the two types of catalyst upon nucleophilic reactions, compared to that of simple quaternary ammonium catalysts and crown ethers. 

Some other 3-thienyl ether derivatives have been prepared. Poly[3-oligo(oxyethylene)-4-methyltiophene] showed an absorption peak at 550 nm (95JCS(CC)2293). On the other hand, poly[3-(N-succinimido(tetra-ethoxy)oxy)-4-methylthiophene] was prepared and it is able to react with amines to give the corresponding carbamate with a 15-crown-5 attached substructure. This polymer showed absorption at 429 nm and fluorescence at 543 nm (04T11169). 

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