流通法による脂肪酸誘導体の合成に関する研究 (第10報) : サフラワー油脂肪酸へのアクリル酸の付加反応

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The catalytic addition reaction of acrylic acid to safflower fatty acids by a flow method was in-vestigated. It was found that the catalyst having phosphoric acid deposited on the synthetic silica-alumina composed of 70% of SiO2 and 29% of Al2O3 has high catalytic activity for the addition reaction of acrylic acid to safflower fatty acids by continuously passing a mixture of acrylic acid and the fatty acids.<BR>The major product separated by column chromatography was analyzed by IR, NMR, and MS spec-trometry and found to be a 1 : 1 adduct of the fatty acids and acrylic acid and to have a cyclohexene ring structure.Moreover, it was suggested that the adduct was formed by the Diels-Alder addition reaction of acrylic acid to the conjugated octadecadienoic acid. It was also observed that the minor adduct which had the structure of 5- or 6-membered ring lactone was formed after the Diels-Alder reaction.
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