A reaction in which a ketone reacts with a peracid to produce an ester. It was discovered in 1899 by J.F.W. Avon Bayer and V. Villiger. For example, as shown in formula (1), when cyclohexyl methyl ketone reacts with m -chloroperbenzoic acid, cyclohexyl acetate and m -chlorobenzoic acid are produced. In general, a ketone R 1 COR 2 reacts with a peracid RCO 3 H to produce an ester R 1 COOR 2 through the reaction pathway shown in formula (2). In this reaction, R 1 or R 2 migrates to oxygen in the intermediate (formula (2) shows the mechanism by which R 2 migrates), but the ease of migration decreases in the order of tertiary alkyl groups (R 2 ) > secondary alkyl groups (R 1 ) > primary alkyl groups (R). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ケトンと過酸との反応によりエステルが生成する反応。1899年J.F.W.A.vonバイヤーとV.ビリガーにより発見された。たとえば式(1)に示すように,シクロヘキシルメチルケトンをm‐クロロ過安息香酸と反応させると,酢酸シクロヘキシルとm‐クロロ安息香酸が生成する。一般に,ケトンR1COR2は過酸RCO3Hと反応して,式(2)に示すような反応経路を通ってエステルR1COOR2となる。このとき,中間体においてR1またはR2が酸素に転位するが(式(2)ではR2が転位する機構が示してある),転位のしやすさは,第三級アルキル基(R2)>第二級アルキル基(R1)>第一級アルキル基(R)の順に減少する。
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