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Shimoyama Y, Nakajima Y. Oxidative Depolymerization of Polyphenylene Oxide into Benzoquinone. CHEMSUSCHEM 2023; 16:e202300684. [PMID: 37772638 DOI: 10.1002/cssc.202300684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 08/28/2023] [Accepted: 08/29/2023] [Indexed: 09/30/2023]
Abstract
Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) is one of the most important engineering plastics commonly utilized in various fields. Herein, chemical recycling of PPO was performed via oxidative depolymerization to form 2,6-diemthyl-p-benzoquionone (26DMBQ) as a sole aromatic product in 66 % yield using nitronium ions (NO2 + ) as a mild oxidant. Mechanistic studies revealed that PPO is oxidized by NO2 + generated from the combination of a silicotungstic acid and nitrate salts, and then subsequently attacked by H2 O to achieve C-O bond cleavage, resulting in the formation of 26DMBQ, which was sublimed at the headspace of the reaction vessel in pure form. 26DMBQ was applied to polymerization with dianilines to form polyimides. Thus, an upgrade recycling process of PPO was demonstrated.
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Affiliation(s)
- Yoshihiro Shimoyama
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Yumiko Nakajima
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
- School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
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2
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Shen T, Liu S, Zhao J, Wang N, Yang L, Wu J, Shen X, Liu ZQ. Electrochemical Aerobic Oxidative Cleavage of (sp 3)C-C(sp 3)/H Bonds in Alkylarenes. J Org Chem 2022; 87:3286-3295. [PMID: 35188765 DOI: 10.1021/acs.joc.1c02947] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
An electrochemistry-promoted oxidative cleavage of (sp3)C-C(sp3)/H bonds in alkylarenes was developed. Various aryl alkanes can be smoothly converted into ketones/aldehydes under aerobic conditions using a user-friendly undivided cell setup. The features of air as oxidant, scalability, and mild conditions make them attractive in synthetic organic chemistry.
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Affiliation(s)
- Tong Shen
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China.,Institute of Molecular Sciences, University of Bordeaux, 351 Cours de la Libération, 33405 Talence, France
| | - Shuai Liu
- Institute of Molecular Sciences, University of Bordeaux, 351 Cours de la Libération, 33405 Talence, France
| | - Jianyou Zhao
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Nengyong Wang
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Le Yang
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Jintao Wu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Xu Shen
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Zhong-Quan Liu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
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3
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Xu L, Ma Z, Hu X, Zhang X, Gao S, Liang D, Wang B, Li W, Li Y. Electroreductive synthesis of polyfunctionalized pyridin-2-ones from acetoacetanilides and carbon disulfide with oxygen evolution. Org Biomol Chem 2022; 20:1013-1018. [PMID: 35043137 DOI: 10.1039/d1ob02379a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A chemical reductant or a sacrificial electron donor is required in any reduction reactions, generally resulting in undesired chemical waste. Herein, we report a reductant-free reductive [3 + 2 + 1] annulation of β-keto amides with CS2 enabled by the synergy of electro/copper/base using water as an innocuous anodic sacrifice with O2 as a sustainable by-product. This electrochemical protocol is mild and provides access to polyfunctionalized pyridin-2-ones from simple starting materials in a single step.
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Affiliation(s)
- Lichun Xu
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Zhongxiao Ma
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Xi Hu
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Xin Zhang
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Shulin Gao
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Deqiang Liang
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Baoling Wang
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Weili Li
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
| | - Yanni Li
- School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
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4
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Xue Y, Guo Z, Chen X, Li J, Zou D, Wu Y, Wu Y. Copper-promoted difunctionalization of unactivated alkenes with silanes. Org Biomol Chem 2022; 20:989-994. [PMID: 35018960 DOI: 10.1039/d1ob02318g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
An efficient copper-catalyzed cascade difunctionalization of N-allyl anilines toward the synthesis of silylated indolines using commercially available silanes has been reported. This strategy provides a new avenue for the synthesis of a diverse array of indolines in reasonable yields. Preliminary mechanistic investigations indicate that the reaction probably proceeds via a radical pathway with unactivated alkenes as radical acceptors and simple silanes as radical precursors. This protocol is distinguished by its atom economy, broad substrate scope and readily available starting materials.
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Affiliation(s)
- Yingying Xue
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450052, People's Republic of China.
| | - Zhuangzhuang Guo
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450052, People's Republic of China.
| | - Xiaoyu Chen
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450052, People's Republic of China.
| | - Jingya Li
- TetranovBiopharm, LLC., Zhengzhou, 450052, People's Republic of China
| | - Dapeng Zou
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450052, People's Republic of China.
| | - Yangjie Wu
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450052, People's Republic of China.
| | - Yusheng Wu
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450052, People's Republic of China. .,Tetranov International, Inc., 100 Jersey Avenue, Suite A340, New Brunswick, NJ 08901, USA.
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5
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Li JZ, Zhang WK, Ge GP, Zheng H, Wei WT. Recent progress in the radical α-C(sp 3)-H functionalization of ketones. Org Biomol Chem 2021; 19:7333-7347. [PMID: 34612358 DOI: 10.1039/d1ob01408k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The direct use structurally simple ketones as α-ketone radical sources for α-C(sp3)-H functionalization is a sustainable and powerful approach for constructing complex and multifunctional chemical scaffolds with diverse applications. The reactions of α-ketone radicals with alkenes, alkynes, enynes, imides, and imidazo[1,2-a]pyridines have broadened the structural diversity and complexity of ketones. Through chosen illustrative examples, we outline the recent progress in the development of methods that enable the radical α-C(sp3)-H functionalization of ketones, with an emphasis on radical initiation systems and possible mechanisms of the transformations. The application of these strategies is illustrated by the synthesis of several biologically active molecules and drug molecules. Further subdivision is based on substrate type and reaction type.
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Affiliation(s)
- Jiao-Zhe Li
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China.
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Cai T, Shen F, Ni Y, Xu H, Shen R, Gao Y. Cascade Radical Annulation of 2-Alkynylthio(seleno)anisoles with Acetone or Acetonitrile: Synthesis of 3-Acetomethyl- or Cyanomethyl-Substituted Benzothio(seleno)phenes. J Org Chem 2021; 86:1002-1011. [PMID: 33284023 DOI: 10.1021/acs.joc.0c02444] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
An efficient method for the direct preparation of 3-aceto(cyano)methyl-substituted benzothio(seleno)phenes has been achieved through C(sp3)-H bond activation of easily available acetone or acetonitrile and cascade radical cyclization reaction. In this cascade radical cyclization reaction, C(sp2)-C(sp3) and C(sp2)-S bonds, as well as benzenethio(seleno)phene skeletons, can be built along with the cleavage of the C(sp3)-S bond, demonstrating the high step-economics and efficiency of this approach.
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Affiliation(s)
- Tao Cai
- College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Fangqi Shen
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Yuqi Ni
- College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Huiting Xu
- College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Runpu Shen
- College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Yuzhen Gao
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
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7
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Kang QQ, Meng YN, Zhang JH, Li L, Ge GP, Zheng H, Liu H, Wei WT. Iron-catalyzed oxidative cyclization of olefinic 1,3-dicarbonyls with ketone C(sp 3)–H bonds: facile access to 2,3-dihydrofurans. NEW J CHEM 2021. [DOI: 10.1039/d1nj02378k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The reaction involves the addition of an α-carbonyl radical to the CC bond of olefinic 1,3-dicarbonyls followed by intramolecular 5-endo-trig cyclization.
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Affiliation(s)
- Qing-Qing Kang
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products
- School of Materials Science and Chemical Engineering
- Ningbo University
- Ningbo
| | - Ya-Nan Meng
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products
- School of Materials Science and Chemical Engineering
- Ningbo University
- Ningbo
| | - Jun-Hao Zhang
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products
- School of Materials Science and Chemical Engineering
- Ningbo University
- Ningbo
| | - Long Li
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products
- School of Materials Science and Chemical Engineering
- Ningbo University
- Ningbo
| | - Guo-Ping Ge
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products
- School of Materials Science and Chemical Engineering
- Ningbo University
- Ningbo
| | - Hongxing Zheng
- Institution of Functional Organic Molecules and Materials
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- China
| | - Hongxin Liu
- College of Chemistry and Materials Engineering
- Institute of New Materials & Industrial Technology
- Wenzhou University
- Wenzhou
- China
| | - Wen-Ting Wei
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products
- School of Materials Science and Chemical Engineering
- Ningbo University
- Ningbo
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Dai E, Dong Y, Kong R, Liu G, Dong Y, Wu Q, Liang D, Ma Y. Transition-metal-free mono- or dinitration of protected anilines. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1752730] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Enrui Dai
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, China
| | - Yongrui Dong
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, China
| | - Rui Kong
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, China
| | - Guangzhang Liu
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, China
| | - Ying Dong
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, China
| | - Qiong Wu
- Yunnan Engineering Technology Research Center for Plastic Films, Kunming, China
| | - Deqiang Liang
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, China
- Yunnan Engineering Technology Research Center for Plastic Films, Kunming, China
| | - Yinhai Ma
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, China
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9
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Synthesis of cyanoalkyl indolines through cyanoalkylarylation of N-allyl anilines with alkyl nitriles under metal-free and neutral conditions. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.05.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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