Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts
In this study, seven types of α-hydroxycarboxylic acids were selected to form composite catalysts with boric acid, and their catalytic properties were studied using the catalytic hydration of α-pinene. The results showed that the composite catalyst of boric acid and tartaric acid had the highest cat...
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MDPI AG
2023-04-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/7/3202 |
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| author | Zhonglei Meng Rongxiu Qin Rusi Wen Guiqing Li Zhongyun Liang Junkang Xie Zhangqi Yang Yonghong Zhou |
| author_facet | Zhonglei Meng Rongxiu Qin Rusi Wen Guiqing Li Zhongyun Liang Junkang Xie Zhangqi Yang Yonghong Zhou |
| author_sort | Zhonglei Meng |
| collection | DOAJ |
| description | In this study, seven types of α-hydroxycarboxylic acids were selected to form composite catalysts with boric acid, and their catalytic properties were studied using the catalytic hydration of α-pinene. The results showed that the composite catalyst of boric acid and tartaric acid had the highest catalytic activity. With an α-pinene, water, acetic acid, tartaric acid, and boric acid mass ratio of 10:10:25:0.5:0.4, the reaction temperature was 60 °C, the reaction time was 24 h, the conversion of α-pinene was 96.1%, and the selectivity of terpineol was 58.7%. The composite catalyst composed of boric acid and mandelic acid directly catalyzed the hydration of α-pinene in the absence of a solvent. Under the optimal conditions, the conversion of α-pinene reached 96.1%, and the selectivity of terpineol was 55.5%. When the composite catalyst catalyzed α-pinene to synthesize terpineol in one step, the terpineol was optically active, and terpineol synthesized using the two-step method with the dehydration of <i>p</i>-menthane-1,8-diol monohydrate was racemic. These composite catalysts may offer good application prospects in the synthesis of terpineol. |
| first_indexed | 2024-03-11T05:29:49Z |
| format | Article |
| id | doaj.art-7eae063e85154a96936d60e3b7f2548b |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T05:29:49Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-7eae063e85154a96936d60e3b7f2548b2023-11-17T17:15:02ZengMDPI AGMolecules1420-30492023-04-01287320210.3390/molecules28073202Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite CatalystsZhonglei Meng0Rongxiu Qin1Rusi Wen2Guiqing Li3Zhongyun Liang4Junkang Xie5Zhangqi Yang6Yonghong Zhou7Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, Nanning 530002, ChinaGuangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, Nanning 530002, ChinaGuangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, Nanning 530002, ChinaGuangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, Nanning 530002, ChinaGuangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, Nanning 530002, ChinaGuangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, Nanning 530002, ChinaGuangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, Nanning 530002, ChinaInstitute of Chemical Industry of Forest Products, Chinese Academy of Forestry (CAF), Nanjing 210042, ChinaIn this study, seven types of α-hydroxycarboxylic acids were selected to form composite catalysts with boric acid, and their catalytic properties were studied using the catalytic hydration of α-pinene. The results showed that the composite catalyst of boric acid and tartaric acid had the highest catalytic activity. With an α-pinene, water, acetic acid, tartaric acid, and boric acid mass ratio of 10:10:25:0.5:0.4, the reaction temperature was 60 °C, the reaction time was 24 h, the conversion of α-pinene was 96.1%, and the selectivity of terpineol was 58.7%. The composite catalyst composed of boric acid and mandelic acid directly catalyzed the hydration of α-pinene in the absence of a solvent. Under the optimal conditions, the conversion of α-pinene reached 96.1%, and the selectivity of terpineol was 55.5%. When the composite catalyst catalyzed α-pinene to synthesize terpineol in one step, the terpineol was optically active, and terpineol synthesized using the two-step method with the dehydration of <i>p</i>-menthane-1,8-diol monohydrate was racemic. These composite catalysts may offer good application prospects in the synthesis of terpineol.https://www.mdpi.com/1420-3049/28/7/3202α-hydroxycarboxylic acid–boric acid complexesgreen catalysthydration of α-pinenesolvent-freeterpineol<i>p</i>-menthane-1,8-diol monohydrate |
| spellingShingle | Zhonglei Meng Rongxiu Qin Rusi Wen Guiqing Li Zhongyun Liang Junkang Xie Zhangqi Yang Yonghong Zhou Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts Molecules α-hydroxycarboxylic acid–boric acid complexes green catalyst hydration of α-pinene solvent-free terpineol <i>p</i>-menthane-1,8-diol monohydrate |
| title | Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts |
| title_full | Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts |
| title_fullStr | Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts |
| title_full_unstemmed | Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts |
| title_short | Study on the Hydration of α-Pinene Catalyzed by α-Hydroxycarboxylic Acid–Boric Acid Composite Catalysts |
| title_sort | study on the hydration of α pinene catalyzed by α hydroxycarboxylic acid boric acid composite catalysts |
| topic | α-hydroxycarboxylic acid–boric acid complexes green catalyst hydration of α-pinene solvent-free terpineol <i>p</i>-menthane-1,8-diol monohydrate |
| url | https://www.mdpi.com/1420-3049/28/7/3202 |
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