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The partial reduction of poly(2-ethyl-2-oxazoline) was investigated. A series of poly(2-ethyl-2-oxazoline-co-N-propylethylene imine)s were synthesized by direct reduction using lithium aluminum hydride or borane/dimethylsulfide (BH<sub>3</sub>/DMS), respectively. It is shown that the degree of reduction can be readily controlled either by the reaction time when using an excess of LiAlH<sub>4</sub> or by the stoichiometry of BH<sub>3</sub>/DMS as was demonstrated by 1H-NMR spectroscopy.doi:10.26434/chemrxiv.5786853 fatcat:4gbcuajmjrgatbdbzn6zvb4gui