ZnCl₂‐Mediated Synthesis of Carboxylic Anhydrides using 2‐Acyl‐4,5‐dichloropyridazin‐3(2H)‐ones

Yong‐Dae Park Department of Chemistry and Research Institute of Basic Sciences, Gyeongsang National University, Chinju, 660‐701, Korea

Jeum‐Jong Kim Department of Chemistry and Research Institute of Basic Sciences, Gyeongsang National University, Chinju, 660‐701, Korea

Ho‐Kyun Kim Department of Chemistry and Research Institute of Basic Sciences, Gyeongsang National University, Chinju, 660‐701, Korea

Su‐Dong Cho Research Institute of Natural Sciences, Changwon National University, Changwon, Korea

Young‐Jin Kang Department of Chemistry and Research Institute of Basic Sciences, Gyeongsang National University, Chinju, 660‐701, Korea

Ki Hun Park Department of Agricural Chemistry, Division of Applied Life Science (BK21 program), Gyeongsang National University, Chinju, Korea

Sang‐Gyeong Lee Department of Chemistry and Research Institute of Basic Sciences, Gyeongsang National University, Chinju, 660‐701, Korea

Yong‐Jin Yoon Department of Chemistry and Research Institute of Basic Sciences, Gyeongsang National University, Chinju, 660‐701, KoreaCorrespondence[email protected]

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Abstract

ZnCl₂ is an efficient catalyst for synthesis of carboxylic acid anhydride from 2‐acyl‐4,5‐dichloropyridazin‐3(2H)‐ones. Treatment of 2‐acyl‐4,5‐dichloropyridazin‐3(2H) ‐ones with ZnCl₂ (0.5 equivalents) and air in refluxing dry THF or acetonitrile gave the corresponding symmetric acid anhydrides in good to excellent yield.

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Acknowledgment

This work was supported by a grant from the Korea Science and Engineering Foundation (KOSEF) Grant (KRF‐2003‐015‐C00338).

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ZnCl₂‐Mediated Synthesis of Carboxylic Anhydrides using 2‐Acyl‐4,5‐dichloropyridazin‐3(2H)‐ones

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ZnCl2‐Mediated Synthesis of Carboxylic Anhydrides using 2‐Acyl‐4,5‐dichloropyridazin‐3(2H)‐ones

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ZnCl₂‐Mediated Synthesis of Carboxylic Anhydrides using 2‐Acyl‐4,5‐dichloropyridazin‐3(2H)‐ones