It is characterized by high reactive activity and high stereoselectivity for asymmetric catalytic hydrogenation, which the value of the stereoselectivity reaches 99.8%.
The use of the multidentate ligand significantly increases stereoselectivity of the reaction.
The carbonyl reductase is excellent in activity and stereoselectivity.
Said systems exhibit improved characteristics in terms of activity and stereoselectivity in comparison to conventional co-catalysts such as AlEt3 and can act simultaneously as co-catalysts and stereoselectivity promoters.
Moreover, this (R)-2-octanol dehydrogenase is excellent in activity and stereoselectivity.
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The process provides both high stereo-selectivity and high yields.
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This results in a marked improvement in the stereoselectivity of the addition reaction and in increased yield.
The present invention relates to an asymmetric Michael Addition reaction to produce nitro ketone diasteroisomers with enhanced stereoselectivity.
The anti-succinates are formed by an Ireland Claisen rearrangement of a silyl ketene acetal which proceeds with high stereoselectivity.
Moreover, the ligand can be used in multimetal catalyzing asymmetric reaction with high activity and stereoselectivity.
The present catalyst composition has high catalyst activity and high stereoselectivity, and is self-extinguishing.
According to the present invention, chiral α-aminonitriles having various structures and high stereoselectivity can be synthesized.
The invention relates to a method of stereoselectivity in the Pd-catalyzed allylic substitution reaction.
The characteristics of the inventive catalyst include a high degree of stereoselectivity, catalytic activity and tolerance to the presence of polar impurities.
Under mild reaction conditions unsaturated esters with high (E)-stereoselectivity are obtained.
Methods of screening for enzyme stereoselectivity that include detecting isotopically labeled products by mass spectrometry are provided.
Regiochemistry and stereochemistry in diels-alder reactions
The process can be easily modified to increase the stereoselectivity of formation of a beta-anomeric nucleoside as necessary.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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