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POLYMERS FOR ADVANCED TECHNOLOGIES · 2018 ·Vol. 29 ·期 6 ·1870-1874 · IF 2.137

Solvent-free ring-opening polymerization of cyclohexene oxide catalyzed by palladium chloride

Haibo Chang,Dongdong Li,Tingting Cao,Qingshuo Li,Zhanwei Bu,Wenshan Zhao,Tong Lin

In this study, we have for the first time demonstrated that palladium chloride (PdCl 2 ) is an efficient catalyst for ring-opening polymerization of cyclohexene oxide in a solvent-free condition. The polymerization product was in atactic structure, and reaction conditions, such as reaction temperature, time, and catalyst amount, showed effects on polymerization conversion yield, turnover number, and number-average molecular weight of the resulting poly(cyclohexene oxide). PdCl 2 catalysis follows a cationic ring-opening mechanism. The polymerization result is highly determined by the chemical structure of the monomers.

研究领域: 化学 · 高分子科学

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Journal of CO2 Utilization · 2018 · IF 5.503

Selective hydrodeoxygenation of lignin β-O-4 model compounds and aromatic ketones promoted by palladium chloride with acidic CO2/MeOH system

Yu Cao,Ran Ma,Ning Wang,Mei-Yan Wang,Xue-Dong Li,Liang-Nian He

Selective hydrogenolysis is a crucial challenge for lignin valorization. A PdCl 2 -catalyzed hydrogenolysis of C OH bond of various lignin β-O-4 alcohol model compounds was developed for preparation of corresponding phenethoxybenzene in 78–98% isolated yield. Notably, the introduction of low-pressure CO 2 (1 MPa) remarkably improves the reaction efficiency and selectivity of phenethoxybenzene. Neither over-reduction of aromatic ring nor further debenzylation was detected. This is understandable that the in situ methylcarbonic acid generated from CO 2 and methanol acts as an acidic catalyst and enhances the leaving ability of hydroxyl group of β-O-4 alcohols. Besides, the present PdCl 2 /CO 2 /MeOH catalyst system proved to be effective for reductive cleavage of C O bonds of β-O-4 ketones, producing ethylbenzenes accompanied with phenols in high yields. Furthermore, this protocol could also be extended to selective hydrodeoxygenation of the carbonyl group to methylene in aromatic ketones. As a sound reaction medium, such in situ CO 2 /MeOH acidic system could be inherently neutralized by depressurizing CO 2 , providing feature advantages for simple post-processing and none waste disposal.

CAS / MDL: 98-86-2

研究领域: 化学 · 催化反应 · 生物质转化

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Solvent-free ring-opening polymerization of cyclohexene oxide catalyzed by palladium chloride

Selective hydrodeoxygenation of lignin β-O-4 model compounds and aromatic ketones promoted by palladium chloride with acidic CO2/MeOH system