enantiomerically การใช้

• Repinotan is an enantiomerically pure aminomethyl chromane derivative with a saccharinylbutyl substituent.
• Enantiomerically pure epoxides are desirable as building blocks for complex molecules with specific chirality.
• The pharmaceutical industry focuses its energy on producing enantiomerically pure compounds to be used as drugs.
• In biotransformation, alcohol dehydrogenases are often used for the synthesis of enantiomerically pure stereoisomers of chiral alcohols.
• All enantiomerically pure chiral molecules crystallise in one of the 65 Sohncke groups ( chiral space groups ).
• When following both pathways, the central chiral carbon preserves its configuration, which is an important part to consider when synthesizing enantiomerically defined drugs.
• An aldol reaction, for example, is inherently diastereoselective; if the aldehyde is enantiopure, the resulting aldol adduct is diastereomerically and enantiomerically pure.
• Phosphinooxazolines are used as ligands in allylic substitution reactions as both enantio-and regioselectivity is required to give an enantiomerically pure product due to the transition state being highly symmetric.
• The 2, 5-dihydropyridine intermediate would then react with " N "-methyl-? 1-pyrrollidium cation to form enantiomerically pure (  )-nicotine.
• Most biological molecules and pharmaceutical targets exist as one of two possible enantiomers; consequently, chemical syntheses of natural products and pharmaceutical agents are frequently designed to obtain the target in enantiomerically pure form.
• The process begins by forming an allylic amine from myrcene, which undergoes asymmetric isomerisation in the presence of a BINAP rhodium complex to give ( after hydrolysis ) enantiomerically pure " R "-citronellal.
• However, in some cases the only available stereoselective methodology relies on chiral auxiliaries and these reactions tend to be versatile and very well-studied, allowing the most time-efficient access to enantiomerically pure products.
• It has been proposed that a bisnoryangonin derivative "'7 "', is then reduced by dehydrogenase to give the polyene precursor "'8 "', that goes through spontaneous 8? conrotatory, 6? disrotatory, and [ 4 + 2 ] cyclization reactions to form endiandric acid C . This proposal is supported by the fact that endiandric acids naturally occur as racemic mixtures and not in an enantiomerically pure form, which should happen if enzymes mediate this process.