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 …

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 …

2014年1月7日 · 用磷叶立德(phosphorous ylide)把羰基化合物转化为烯烃的反应叫Wittig反应。 ・如果利用经典的E2消去反应条件，反应需要强酸或强碱或高温条件。 另外，常面临位置选择 …

2018年2月6日 · Below is a useful reaction called the Wittig reaction that achieves this transformation. It won its inventor, Georg Wittig, the 1979 Nobel Prize in Chemistry (along with …

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 …

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 …

A betaine (/ ˈ b iː t ə. iː n, b ɪ ˈ t eɪ-,-ɪ n /) in chemistry is any neutral chemical compound with a positively charged cationic functional group that bears no hydrogen atom, such as a …

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 …

2023年1月23日 · Following the initial carbon-carbon bond formation, two intermediates have been identified for the Wittig reaction, a dipolar charge-separated species called a betaine and a …

Is the Wittig Reaction Concerted or Step-wise? Over much of its history, the Wittig reaction has been described as a stepwise ionic process. Instead of concerted (one-step) [2+2] …