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iNTRODUCTiON TO ORGANiC COMPOUNDS
iNTRODUCTiON TO ORGANiC COMPOUNDS

... The last group of compounds we are going to discuss includes some that are of great importance and interest today. Included are the chlorofluorocarbons that are used in refrigeration and air conditioning systems and which are thought to be involved in the depletion of ozone in the upper atmosphere. ...
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... ?n in the presence of a catalyst comprising a vanadium pound at reaction conditions, and recovering the resultant ether. 50 containing compound will be effected at reaction condi tions which include an elevated temperature in the range ‘ A speci?c embodiment of this invention is found in a of from a ...
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Asymmetric induction



Asymmetric induction (also enantioinduction) in stereochemistry describes the preferential formation in a chemical reaction of one enantiomer or diastereoisomer over the other as a result of the influence of a chiral feature present in the substrate, reagent, catalyst or environment. Asymmetric induction is a key element in asymmetric synthesis.Asymmetric induction was introduced by Hermann Emil Fischer based on his work on carbohydrates. Several types of induction exist.Internal asymmetric induction makes use of a chiral center bound to the reactive center through a covalent bond and remains so during the reaction. The starting material is often derived from chiral pool synthesis. In relayed asymmetric induction the chiral information is introduced in a separate step and removed again in a separate chemical reaction. Special synthons are called chiral auxiliaries. In external asymmetric induction chiral information is introduced in the transition state through a catalyst of chiral ligand. This method of asymmetric synthesis is economically most desirable.
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