
Selective Oxidative Lactonization of 1,6-Hexanediol into ε-Caprolactone
Xiaoyu Shen, Zhongtian Du, Bairui Guo, Zhongxu Guo, Changhai Liang
Prog Chem ›› 2023, Vol. 35 ›› Issue (8) : 1191-1198.
Selective Oxidative Lactonization of 1,6-Hexanediol into ε-Caprolactone
ε-Caprolactone is a key monomer for the synthesis of poly(ε-caprolactone) (PCL) with good biocompatibility and biodegradability, and relevant polymer materials could be applied in pharmaceutical, medicinal, and packaging applications. Green and economic synthesis of ε-caprolactone is vital to popularize such eco-friendly polymers, and selective oxidative lactonization of 1,6-hexanediol into ε-caprolactone remains to be developed. In this review, different routes for the synthesis of ε-caprolactone such as Baeyer-Villiger oxidation of cyclohexanone and oxidative lactonization of 1,6-hexanediol are comparatively analyzed. According to whether electron acceptors (oxidants) are added to the reaction systems, the related advances of oxidative lactonization of 1,6-hexanediol are summarized, and the advantages and disadvantages of the corresponding reaction systems and catalysts are reviewed. The development trend of oxidative lactonization of 1,6-hexanediol into ε-caprolactone is also proposed.
1 Introduction
2 Catalytic oxidation processes
2.1 Carbonyl compounds act as electron acceptors
2.2 Molecular oxygen acts as the electron acceptor
2.3 H2O2acts as the oxidant
3 Catalytic dehydrogenation
3.1 Homogeneous catalysts
3.2 Heterogeneous catalysts
4 Conclusion and outlook
poly(ε-caprolactone) / ε-caprolactone / 1,6-hexanediol / catalytic oxidation / catalytic dehydrogenation / molecular oxygen
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