Wittig reaction - Wikipedia
The Wittig reaction or Wittig olefination is a chemical reaction of an aldehyde or ketone with a triphenyl phosphonium ylide called a Wittig reagent. Wittig reactions are most commonly used to convert aldehydes and ketones to alkenes.
Wittig Reaction - Organic Chemistry Portal
The Wittig Reaction allows the preparation of an alkene by the reaction of an aldehyde or ketone with the ylide generated from a phosphonium salt. The geometry of the resulting alkene depends on the reactivity of the ylide. If R is an electron withdrawing group, then the ylide is stabilized and is not as reactive as when R is alkyl.
Wittig Reaction - Examples and Mechanism - Master Organic …
2018年2月6日 · The Wittig Reaction converts aldehydes and ketones into alkenes through reaction with a phosphorus ylide. Mechanism and examples below.
维蒂希反应 - 维基百科，自由的百科全书
维蒂希反应（英語： Wittig reaction ）是醛或酮与三苯基磷鎓內鹽（维蒂希试剂）作用生成烯烃和三苯基氧膦的一类有机化学反应，以发明人德国化学家格奥尔格·维蒂希的姓氏命名。
wittig反应 - 百度百科
本反应是由仲 烃基 溴(较典型)与 三苯磷 作用生成 叶立德 (Ylides，分子内 两性离子)，后者与醛或酮反应(Wittig 反应)，给出 烯烃 和氧化三苯磷，反应形式（如图1）：
有机人名反应——Wittig反应（维蒂希反应） - 知乎专栏
2021年12月24日 · Wittig反应（维蒂希反应）是醛或酮与磷叶立德（Wittig试剂）发生亲核加成生成烯烃反应，该反应由德国化学家Georg Wittig在1954年发现，为此他获得了1979年的诺贝尔化学奖。
Wittig Reaction - Chemistry LibreTexts
2023年1月23日 · The Wittig reaction or Wittig olefination is a chemical reaction of an aldehyde or ketone with a triphenyl phosphonium ylide (often called a Wittig reagent) to give an alkene and triphenylphosphine oxide. The Wittig reaction was discovered in 1954 by Georg Wittig, for which he was awarded the Nobel Prize in Chemistry in 1979.
The Wittig Reaction - Chemistry LibreTexts
2023年1月23日 · Organophosphorus ylides react with aldehydes or ketones to give substituted alkenes in a transformation called the Wittig reaction. This reaction is named for George Wittig who was awarded the Nobel …
2007年2月12日 · Over much of its history, the Wittig reaction has been described as a stepwise ionic process. The hypothetical betaine intermediates were never observed, but lithium halide adducts could be isolated in some of the early Wittig experiments. The …
The Wittig reaction, discovered in 1954 by Georg Wittig, is one of the most common tech- niques used for the stereoselective preparation of alkenes. Broadly speaking, the reaction