asymmetric synthesis

Chemical reaction by which unequal amounts of two product isomers are formed. It is normally not possible to synthesize from materials that do not have optical activity (i.e., are not chiral) one stereoisomer of a chiral compound without the other, but use of a chiral auxiliary, such as an enzyme or other catalyst, a solvent, or an intermediate, can force the reaction to produce predominantly or only one isomer. Asymmetric syntheses are often called stereoselective; if one product forms exclusively, it is stereospecific.

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The term synthesis (from the ancient Greek σύνθεσις σύν "with" and θέσις "placing") is used in many fields, usually to mean a process which combines together two or more pre-existing elements resulting in the formation of something new. The verb would be to synthesize meaning to make or form a synthesis. Synthesis may refer to:

*subtractive synthesis
*frequency modulation synthesis

*Organic synthesis, the synthesis of organic compounds
*Peptide synthesis, a special case
*Total synthesis, the complete chemical synthesis of complex organic compounds, usually without the aid of biological processes
*Biosynthesis, that occurs in living organisms

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