Patent ID: 8349969
Filing Date: 2013-01-08
Classification: C08G

Abstract:
1. A method for preparing PEG aldehyde represented by Chemical Formula 1 by reacting a PEG derivative represented by Chemical Formula 4 with dimethyl sulfoxide and dicyclohexylcarbodiimide: wherein n represents an integer from 3 to 2000; and k represents an integer from 3 to 10; wherein the PEG derivative represented by Chemical Formula 4 is first prepared by a process comprising the steps of: reacting PEG represented by Chemical Formula 3 with cyanoalkene represented by Chemical Formula 5 to prepare cyanoalkyl-PEG represented by Chemical Formula 6; preparing PEG-carboxylic acid represented by Chemical Formula 7 from the cyanoalkyl-PEG represented by Chemical Formula 6; reacting the PEG-carboxylic acid represented by Chemical Formula 7 with alcohol represented by Chemical Formula 8 to prepare a PEG-ester compound represented by Chemical Formula 9; and reducing the PEG-ester compound represented by Chemical Formula 9 to prepare the PEG derivative represented by Chemical Formula 4: R