PRODUCTION OF 2,3-DIMETHYLBUTENE-2

PURPOSE:Isopropyl chloride and acetone is used as starting materials to effect Grignard reaction, the product is hydrolyzed, dehydrated, the resultant mixture is separated, and 2,3-dimethylbutene-1, a by-product, is isomerized to produce the titled compound easily in high yield. CONSTITUTION:2,3-Dim...

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Bibliographic Details
Main Authors SAITOU KENJI, YAMACHIKA HIROSHI, TAKIZAWA YUKIHISA, KOUNO NOBUHARU
Format Patent
LanguageEnglish
Published 27.08.1983
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:PURPOSE:Isopropyl chloride and acetone is used as starting materials to effect Grignard reaction, the product is hydrolyzed, dehydrated, the resultant mixture is separated, and 2,3-dimethylbutene-1, a by-product, is isomerized to produce the titled compound easily in high yield. CONSTITUTION:2,3-Dimethylbutene-2 is obtained by the following processes: (a) the preparation of isopropylmagnesium chloride from isopropyl chloride and metallic magnesium, (b) the reaction of the product with acetone, (c) the hydrolysis of the reaction product in (b) in a neutral or weakly acidic medium, (d) the dehydration of the above product in the presence of an acid catalyst such as sulfuric acid into a mixture of 2,3-dimethylbutene-2 and 2,3-dimethylbutene-1, (e) the isolation of 2,3-dimethylbutene-2 from the mixture and (f) the isomerization of the remaining 2,3-dimethylbutene-1 in the process (e) by sending it to the process (d).
Bibliography:Application Number: JP19820028263