Abstract
1. 1. The ease of dehydration of isopentene alcohols with acid catalysts decreases in the sequence 2-methyl 3-buten-2-ol>3-methyl 2-buten-1-ol>3-methyl 3-buten-1-ol The activity of catalysts in this reaction decreases in the following sequence: aluminosilicate>alumina>calcium phosphate . 2. 2. The low isoprene yield during dehydration of 3-methyl 3-buten-1-o1 in the presence of alumina and aluminosilicate is due to the cyclization of alcohol to β-methyltetrahydrofuran and subsequent splitting of oxacyclane to formaldehyde and isobutene. In the presence of tri-calcium phosphate which slightly accelerates cyclization, a high isoprene yield is obtained. 3. 3. The following reactions accompany dehydration of isopentene alcohols: isomerization of 3-methyl 2-buten-1-ol to isovaleric aldehyde, allyl re-grouping of 2-methyl 3-buten-2-ol to 3-methyl 2-buten-1-ol and 3-methyl 3-buten-1-ol and polymerization of isoprene. Alumina and aluminosilicate are more active in these reactions than calcium phosphate.
Published Version
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