Acceleration and selectivity enhancement of Diels-Alder reactions by special and catalytic methods

Article Abstract:

A discussion on the physical and catalytic methods which enhance the rate and selectivity of the Diels-Alder reactions is presented. Methods found to induce the rates and selectivities of the Diels-Alder reactions are the application of high pressure, ultrasound, hydrophobic packing, the addition of proteins to the reaction mixture, the presence of heterogenous inorganic catalysts, Bronsted acids and the performance of the reaction in a solid polymer base.

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Asymmetric boron-catalyzed reaction

Article Abstract:

Various catalytic methods for asymmetric synthesis discussed, analyzed and their efficiency, selectivity and fexibility are evaluated. It is found that chirally modified boron complexes can induce chirality. The chiral boron complexes can catalyze a wide variety of reactions and make the catalyst chiral precursor easily recoverable. They are also available in enantiomeric forms and the configuration of the products could easily be predicted and obtained.

Boron, Boron (Chemical element)

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Enantiomerically pure cyclopentadienes

Article Abstract:

An experiment which aims to simulate nature's way of synthesizing pure enatiomers which uses well-defined enzymes is discussed. The enzymes pick up racemic or prochiral substrates which are eventually converted into pure enantiomers by highly diastereoselective methods. It is recognized that the Diels-Alder cycloadditions play a vital role in the enantioselective synthesis of homochiral 4pi-systems.

Enantiomers, Cyclopentadiene

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