γ-ブチロラクトンの利用研究 (第3報)
2-メチル-4,5-ジヒドロ-3-フランカルボン酸メチルのPechmann反応
1960 年 80 巻 10 号 p. 1487-1488
詳細
1960 年 80 巻 10 号 p. 1487-1488
Condensation of 2-methyl-3-methoxycarbonyl-4, 5-dihydrofuran (II), obtained by the rearrangement reaction of acetobutyrolactone, and phenols in 80% sulfuric acid with phosphoryl chloride was examined and the products obtained were found to be identical with the condensates of acetobutyrolactone by the Pechmann reaction reported in the preceding paper. From this fact, the dihydrofuran ring in (II) reacts as enol-ether in the present reaction and that the cleavage of furan ring precedes in this reaction.
