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Updated: Jun 19, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Conversion of all polyester units to amines: Ruthenium-catalyzed, acid-assisted hydrogenative amination
Xiangchao Xu1, Yanwei Gu1,2, Bin Liu3
1Zhejiang Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.
Abstract:
Herein, we report an efficient strategy for upcycling waste polyesters into a range of primary, secondary, and tertiary diamines and amines via ruthenium-catalyzed, acid-assisted hydrogenative amination. To our knowledge, this previously unknown methodology can convert all structural units of end-of-life polyesters into corresponding (di)amines. The protocol demonstrates excellent applicability by successfully transforming even the most challenging real-world polyester wastes containing diverse impurities, achieving high yields of up to 98%. Mechanistic investigations elucidate two distinct reaction pathways: The acyl moiety undergoes transformation via a hydrogenation-condensation-hydrogenation sequence, while an acid-assisted hydrogen-borrowing pathway converts the alcohol moiety. This study provides fundamental insights into concurrent hydrogenation and dehydrogenation processes within a unified catalytic system.
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