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Wikimedia Commons. South-southwest view of Pöndorf. Pair your accounts. Export articles to Mendeley Get article recommendations from ACS based on references in your Mendeley library.
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Organic Letters , 11 4 , Graves,, Hongying Zhou,, Charlotte L. Stern, and, SonBinh T. The Journal of Organic Chemistry , 72 24 , Mojtahedi,, Elahe Akbarzadeh,, Roholah Sharifi, and, M.
Saeed Abaee. Organic Letters , 9 15 , Graves,, Bi-Shun Zeng, and, SonBinh T. Efficient and Selective Al-Catalyzed Alcohol Oxidation via Oppenauer Chemistry.
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Abboud, and, Ryan C. Coupling of an Aldehyde or Ketone to Pyridine Mediated by a Tungsten Imido Complex. Inorganic Chemistry , 44 25 , Greco,, Michael J.
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Cecilia, R. Moreno-Tost, J. Requies, P. Applied Catalysis A: General , , Ponndorf Hose Pumps What are Ponndorf Hose Pumps?
Ponndorf Hose Pumps in Industrial Applications Examples of Further Industries Using Ponndorf Hose Pumps What are Ponndorf Hose Pumps?
Pump principle: Ponndorf Hose Pumps of the Series PX and PK During the suction process the displacement elements are pressing the air resp.
Ponndorf hose pumps in industrial applications: Chemical Industry Leading companies in the chemical industry are using Ponndorf hose pumps because of their resistance against acids and lyes for the equipment of reliable and economical processing plants.
The MPV reduction was discovered by Meerwein and Schmidt, and separately by Verley in They found that a mixture of aluminium ethoxide and ethanol could reduce aldehydes to their alcohols.
The MPV reduction is believed to go through a catalytic cycle involving a six-member ring transition state as shown in Figure 2. Starting with the aluminium alkoxide 1 , a carbonyl oxygen is coordinated to achieve the tetra coordinated aluminium intermediate 2.
Between intermediates 2 and 3 the hydride is transferred to the carbonyl from the alkoxy ligand via a pericyclic mechanism.
At this point the new carbonyl dissociates and gives the tricoordinated aluminium species 4. Finally, an alcohol from solution displaces the newly reduced carbonyl to regenerate the catalyst 1.
Each step in the cycle is reversible and the reaction is driven by the thermodynamic properties of the intermediates and the products.
This means that given time the more thermodynamically stable product will be favored. Several other mechanisms have been proposed for this reaction, including a radical mechanism as well as a mechanism involving an aluminium hydride species.
The direct hydride transfer is the commonly accepted mechanism recently supported by experimental and theoretical data.
One of the great draws of the Meerwein—Ponndorf—Verley reduction is its chemoselectivity. Aldehydes are reduced before ketones allowing for a measure of control over the reaction.
If it is necessary to reduce one carbonyl in the presence of another, the common carbonyl protecting groups may be employed.
Groups, such as alkenes and alkynes, that normally pose a problem for reduction by other means have no reactivity under these conditions.
The aluminium based Meerwein—Ponndorf—Verley reduction can be performed on prochiral ketones leading to chiral alcohols.
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