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- Title
An inexpensive and efficient synthetic method for the preparation of pyromellitic dianhydride promoted by ionic liquid.
- Authors
Yu Lin Hu; Ming Lu; Xiao Bin Liu; Sheng Bin Zhang; Zhan Hui Ji; Ting Ting Lu
- Abstract
In this article, pyromellitic dianhydride could be successfully obtained in 76.7% total yield by an aerobic oxidation of 1,4-bis(chloromethyl)-2,5-dimethylbenzene or 1,5-bis(chloromethyl)-2,4-dimethylbenzene catalyzed by VO(acac)2/Cu(2-Eth)2/DABCO in [hmim]OTf and a subsequent dehydration of pyromellitic acid upon heating with acetic anhydride. The starting materials including 1,2-bis(chloromethyl)-4,5-dimethylbenzene were prepared by dichloromethylation of their corresponding xylene catalyzed by [C12mim]Br in aqueous media.
- Subjects
CHEMISTRY experiments; ANALYTICAL chemistry; HYDRIDES; ANHYDRIDES; IONIC liquids; CHLORAMINES; METHYLATION; OXIDATION; CHLOROMETHYL group; TOLIDINE
- Publication
ARKIVOC: Online Journal of Organic Chemistry, 2010, p63
- ISSN
1551-7004
- Publication type
Article