A reaction that uses an ylide of a phosphorus compound (phosphorane or phosphonium) to convert the carbonyl (C=O) of an aldehyde or ketone to a methylene (C=CHR, where R is various substituents). It is called the Wittig reaction or Wittig reaction after its discoverer, Georg Wittig (1897-1987) of West Germany. Until then, there had been no reaction that could convert the carbonyl group of a ketone or aldehyde to C=CHR in one step, but the Wittig reaction made it possible, and Wittig was awarded the Nobel Prize in Chemistry in 1979. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
リン化合物(ホスホランまたはホスホニウム)のイリドを用いて,アルデヒドまたはケトンのカルボニル(C=O)をメチレン(C=CHR,Rは種々の置換基)に変換する反応。発見者である西ドイツのウィティヒGeorg Wittig(1897‐1987)にちなんでウィティヒ反応またはビッティヒ反応と呼ばれる。それまでケトンやアルデヒドのカルボニル基をC=CHRに1段階で変える反応はなかったが,ウィティヒ反応によってそれが可能となり,ウィティヒは1979年ノーベル化学賞を受賞した。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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