Hyaluronidase-catalyzed copolymerization was carried out with monomer combinations of 2-methyl (1a)/2-vinyl (1b), 2-methyl (1a)/2-ethyl (1c), 2-methyl (1a)/2-n-propyl (1d), and 2-vinyl (1b)/2-ethyl (1c) oxazoline derivatives of hyalobiuronate [GlcA beta(1 -> 3)GlcN]. All copolymerization reactions proceeded successfully in a regio and stereoselective manner, giving rise to hyaluronan derivatives bearing different N-acyl groups at the C2 position of the glucosamine unit in the polymer chain. The composition of the N-acyl groups was controlled by varying the comonomer feed ratio. The copolymerization mechanism was also discussed.
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