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- W2377897672 abstract "A new process for the synthesis of 4-acetoxy-2-methyl-2-butenal was proposed which involves three steps the addition reaction of isoprene with hypochloric acid, esterification of the additive results with acetic anhydride followed by allyl rearrangement of 1,2-position product, oxidation of the ester obtained to form the target C5-aldehyde, with an overall yield of 65%. The addition reaction of isoprene was conducted by controlling of the acidity with the adding carbon dioxide. When the reaction was operated under 0~5℃ for 5~6h, 1-chloro-2-methyl-3-buten-2-ol and 4-chloro-3-methyl-2-buten-1-ol was got in 72% yield. The acquired alcohol was esterified with diacetyl oxide and followed by allyl rearrangement to get 1-acetoxy-4-chloro-3- met-hyl-2-butene in 95% yield. During the esterification, a periodinic acid supported on cation exchange resin was used as catalysts, and the reacting temperature was 25~50C, the time of esterification and rearrangement could be shortened from 24h for the former process to within 5h for the new process. Finally the 1-acetoxy-4-chloro-3-methyl-2-butene was oxidized by DMSO to get 4-acetoxy-2- methyl-2-butenal in 97% yield by using TEMPO catalyst." @default.
- W2377897672 created "2016-06-24" @default.
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- W2377897672 date "2004-01-01" @default.
- W2377897672 modified "2023-09-25" @default.
- W2377897672 title "New Process for the Synthesis of 4-acetoxy-2-methyl-2-butenal" @default.
- W2377897672 hasPublicationYear "2004" @default.
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