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A sample of cyclic oligo(undecanamide)s (1) (nylon 11 s), containing from the cyclic monomer to at least the cyclic hexamer, was conveniently prepared (57% yield) by the cyclo-oligomerization of 11-aminoundecanoic acid p-nitrophenyl ester under high dilution conditions. The cyclics, obtained free of linear oligomers by virtue of their greater solubilities in chloroform, were analysed by fast atom...
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