Aldol Condensations of Aldehydes over Disodium Phthalocyanine

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概要

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• Disodium phthalocyanine (Pc–Na<SUB>2</SUB>) acts as a base for the aldol condensations of aldehydes, although it shows no effect upon those of ketones. In the aldol condensation of isobutyl aldehyde by Pc–Na<SUB>2</SUB> in <I>n</I>-hexane, 2,6-diisopropyl-5,5-dimethyl-1,3-dioxane-4-ol (III) is produced through two processes with different rates; the reaction proceeds first by the slower rate, and then by a more rapid rate after a certain reaction period. The process is different from that of the catalysis by sodium ethoxide. During the reaction, Pc–Na<SUB>2</SUB> is converted to sodium-free phthalocyanine (Pc–H<SUB>2</SUB>) <I>via</I> an intermediate. The formation of the intermediate results in the retardation of the aldol condensation with the product and phthalocyanine anions. Furthermore, the adsorption of water on Pc-Na<SUB>2</SUB> brings about the retardation of the reaction.

• 公益社団法人 日本化学会の論文

著者

• Inoue Hiroo

  Department Of Applied Chemistry College Of Engineering Osaka Prefecture University

• Imoto Eiji

  Department of Applied Chemistry College of Engineering The University of Osaka Prefecture

• Kunikawa Kenzo

  Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture

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