ultrarapid reaction - ορισμός. Τι είναι το ultrarapid reaction
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Τι (ποιος) είναι ultrarapid reaction - ορισμός

Dotz reaction; Doetz reaction; Dötz reaction; Wulff-Dotz reaction; Wulff-Dötz reaction; Wulff–Dotz reaction

Cascade reaction         
  • Fig. 1: Structure of Routiennocin 1
  • Fig. 2: Representative examples of synthetic targeting using polyring forming processes
  • 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 10.''' Electrocyclic cascade in the total synthesis of (–)-colombiasin A
  • '''Scheme 11.''' Pericyclic sequence for the synthesis of [2,2]paracyclophanes
  • '''Scheme 12.''' Rhodium-catalyzed hydroformylation cascade for the preparation of 4''H''-chromens
  • '''Scheme 13.''' Rhodium(II)-carbenoid-initiated cascade in the synthesis of a tigliane
  • '''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
  • '''Scheme 16.''' Palladium-catalyzed Heck cascade in the enantioselective synthesis of (+)-xestoquinone
  • '''Scheme 1.''' Synthesis of (–)-chloramphenicol via a nucleophilic cascade
  • '''Scheme 2.''' Cascade reaction in the total synthesis of (±)-pentalenene
  • 797x797px
  • '''Scheme 4.''' Asymmetric synthesis of ''tetra''-substituted cyclohexane carbaldehydes via a triple organocatalytic cascade reaction
  • '''Scheme 5.''' Proposed catalytic cycle for the asymmetric triple organocatalytic cascade
  • '''Scheme 6.''' Cascade radical cyclization in the total synthesis of (±)-hirsutene
  • '''Scheme 7.''' Cascade radical cyclization in the synthesis of (–)-morphine
  • '''Scheme 8.''' Pericyclic cascade in the synthesis of endiandric acid derivatives
  • '''Scheme 9.''' Pericyclic cascade in the total synthesis of (–)-vindorosine
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.
https://en.wikipedia.org/wiki/Cascade_reaction
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.
https://en.wikipedia.org/wiki/Étard_reaction
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

Βικιπαίδεια

Wulff–Dötz reaction

The Wulff–Dötz reaction (also known as the Dötz reaction or the benzannulation reaction of the Fischer carbene complexes) is the chemical reaction of an aromatic or vinylic alkoxy pentacarbonyl chromium carbene complex with an alkyne and carbon monoxide to give a Cr(CO)3-coordinated substituted phenol. Several reviews have been published. It is named after the German chemist Karl Heinz Dötz (b. 1943) and the American chemist William D. Wulff (b. 1949) at Michigan State University. The reaction was first discovered by Karl Dötz and was extensively developed by his group and W. Wulff's group. They subsequently share the name of the reaction.

The position of the substituents is highly predictable with the largest alkyne substituent (RL) neighboring the phenol and the smallest alkyne substituent (RS) neighboring the methoxy group. Hence, this reaction is more useful for terminal alkynes than internal alkynes.

The phenol can be liberated from the chromium complex by a mild oxidation, such as ceric ammonium nitrate or air oxidation.

Since this reaction can quickly generate complex phenolic compounds, the Wulff–Dötz reaction has been used most often in the synthesis of natural products, especially Vitamins E and K. It is also applicable to the synthesis of polyphenolic compounds, such as calixarenes.

https://en.wikipedia.org/wiki/Wulff–Dötz reaction
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