stereoselektivní

Stereoselektivní refers to a chemical reaction that favors the formation of one stereoisomer over other possible stereoisomers. In organic chemistry, many reactions can produce molecules with chiral centers, leading to different spatial arrangements of atoms. When a reaction is stereoselective, it means that the product obtained is not a random mixture of all possible stereoisomers, but rather one specific stereoisomer is produced in a significantly higher proportion. This selectivity can be expressed in terms of enantiomeric excess (ee) or diastereomeric excess (de), which quantify the degree to which one stereoisomer is favored. Stereoselective reactions are crucial in the synthesis of pharmaceuticals and other complex organic molecules where the biological activity or physical properties are highly dependent on the specific stereochemistry of the molecule. Achieving stereoselectivity often involves using chiral catalysts, chiral reagents, or specific reaction conditions that guide the formation of the desired stereoisomer. Understanding and controlling stereoselectivity is a fundamental aspect of modern synthetic chemistry.