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Qué (quién) es Étard reaction - definición
Étard reaction
OXIDISATION REACTION
Etard Reaction; Etard; Etard reaction; Étard Reaction
The Étard reaction is a chemical reaction that involves the direct oxidation of an aromatic or heterocyclic bound methyl group to an aldehyde using chromyl chloride.
Cascade reaction
![Heathcock]]'s synthesis of dihydroprotodaphniphylline features a highly efficient cascade involving two aldehyde/amine condensations, a Prins-like cyclization, and a 1,5-hydride transfer to afford a pentacyclic structure from an acyclic starting material.](https://commons.wikimedia.org/wiki/Special:FilePath/Dihydroprotodaphniphylline synthesis.png?width=200 "Heathcock]]'s synthesis of dihydroprotodaphniphylline features a highly efficient cascade involving two aldehyde/amine condensations, a Prins-like cyclization, and a 1,5-hydride transfer to afford a pentacyclic structure from an acyclic starting material.")
!['''Scheme 11.''' Pericyclic sequence for the synthesis of [2,2]paracyclophanes](https://commons.wikimedia.org/wiki/Special:FilePath/Scheme 11 - peri - pcyclophane.svg?width=200 "'''Scheme 11.''' Pericyclic sequence for the synthesis of [2,2]paracyclophanes")
!['''Scheme 14.''' Gold-catalyzed
formal intramolecular [4+2] cycloaddition of 1,6-enynes](https://commons.wikimedia.org/wiki/Special:FilePath/Scheme 14 - metal - gold enyne.svg?width=200 "'''Scheme 14.''' Gold-catalyzed
formal intramolecular [4+2] cycloaddition of 1,6-enynes")
!['''Scheme 15.''' Proposed cascade process in the formal intramolecular [4+2] cycloaddition of 1,6-enynes](https://commons.wikimedia.org/wiki/Special:FilePath/Scheme 15 - metal - gold enyne mech.svg?width=200 "'''Scheme 15.''' Proposed cascade process in the formal intramolecular [4+2] cycloaddition of 1,6-enynes")
CHEMICAL PROCESS
Tandem reaction; Domino reaction; Negishi zipper reaction; Negishi-Zipper reaction
A cascade reaction, also known as a domino reaction or tandem reaction, is a chemical process that comprises at least two consecutive reactions such that each subsequent reaction occurs only in virtue of the chemical functionality formed in the previous step.Tietze, L.
reaction
WIKIMEDIA DISAMBIGUATION PAGE
RXN; Reactions; Reaction (disambiguation)
(reactions)
Frequency: The word is one of the 1500 most common words in English.
1.
Your reaction to something that has happened or something that you have experienced is what you feel, say, or do because of it.
Reaction to the visit is mixed...
He was surprised that his answer should have caused such a strong reaction.
N-VAR: usu with supp
2.
A reaction against something is a way of behaving or doing something that is deliberately different from what has been done before.
All new fashion starts out as a reaction against existing convention...
N-COUNT: N against n
3.
If there is a reaction against something, it becomes unpopular.
Premature moves in this respect might well provoke a reaction against the reform...
N-SING: also no det, N against n
4.
Your reactions are your ability to move quickly in response to something, for example when you are in danger.
The sport requires very fast reactions.
N-PLURAL: oft poss N
5.
Reaction is the belief that the political or social system of your country should not change.
Thus, he aided reaction and thwarted progress.
N-UNCOUNT [disapproval]
6.
A chemical reaction is a process in which two substances combine together chemically to form another substance.
Ozone is produced by the reaction between oxygen and ultra-violet light...
N-COUNT
7.
If you have a reaction to a substance such as a drug, or to something you have touched, you are affected unpleasantly or made ill by it.
Every year, 5000 people have life-threatening reactions to anaesthetics...
N-COUNT: oft adj N to n
