Claisen, L.

Japanese: Claisen,L.(英語表記)ClaisenL
Claisen, L.

...A general term for the condensation reaction of compounds with a carbonyl group, such as aldehydes, ketones, and esters, that have a hydrogen atom at the α-position of the carbonyl group (active methylene compounds). It was named after the German organic chemist L. Claisen (1851-1930), who first reported it in 1881. It usually refers to reactions involving esters. The reaction is carried out in a solvent system in which a catalytic amount of sodium is added to alcohol. For example, two molecules of ethyl acetate condense in ethyl alcohol in the presence of a catalytic amount of sodium ethylate NaOCH 2 CH 3 to produce acetoacetic ester. ...

*Some of the terminology that mentions "Claisen, L." is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…アルデヒド,ケトン,エステルなどのカルボニル基のα位に水素が存在する化合物(活性メチレン化合物)とカルボニル基を有する化合物の縮合反応の総称。1881年ドイツの有機化学者クライゼンL.Claisen(1851‐1930)によって最初に報告されたので,この名が付けられた。通常,エステルが関与する場合の反応をいうことが多い。触媒量のナトリウムをアルコールに加えた溶媒系中で反応が行われる。たとえば,酢酸エチルは触媒量のナトリウムエチラートNaOCH2CH3の存在下,エチルアルコール中で2分子縮合し,アセト酢酸エステルを生成する。…

※「Claisen,L.」について言及している用語解説の一部を掲載しています。

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

<<:  Clam chowder

>>:  Clair Omar Musser

Recommend

Sasa megalophylla (English spelling)

…[Tetsuo Koyama]. … *Some of the terminology that...

Bayes, T.

…Also known as Bayes' theorem, named after th...

The Great Bunsei Fire

The Great Fire of Edo in 1829 (Bunsei 12). It star...

Oliver filter

A type of vacuum rotary cylinder filter, originall...

Acetobacter pasteurianum

…[Tsubaki Keisuke]. . . *Some of the terminology ...

Norlund, E.

…Next, the relationship obtained from the definit...

Scafell Pike

…Reflecting this geological structure, the topogr...

vedana (English spelling)

…Of these, rūpa (form) includes the five sense or...

Imāmzāda (English spelling)

The term refers to the descendants of Shiite Musli...

gaṇa (English spelling) gana

…A tribal republic is a state that does not have ...

Iroha Karuta

A type of song karuta aimed at children. It consi...

Molybdate - Molybdenum salt

A salt of molybdic acid with the general formula x...

Kawachi carp - Kawachi carp

This is a breed of Gengorobuna, a species endemic...

Stable - Kyusha

1. A shed for keeping cows and horses. 2. In horse...