In "'biocatalysed asymmetric synthesis "', a non-chiral unit becomes chiral in such a way that the different possible stereoisomers are formed in different quantities.
32.
One example is the asymmetric synthesis of the drug warfarin ( in equilibrium with the hemiketal ) in a Michael addition of 4-hydroxycoumarin and benzylideneacetone:
33.
The most widely used method for the asymmetric synthesis of " N "-sulfinyl imines is the condensation of enantiopure primary sulfinamides with aldehyde or ketones.
34.
It is still possible to distinguish between the two enantiomers by using them control the asymmetric synthesis of another chemical whose stereochemical nature can be measured.
35.
For his discovery of chemical reactions-- the Sharpless Asymmetric Epoxidation, Dihydroxylation, and Aminohydroxylation-- which have revolutionized organic chemistry by transforming asymmetric synthesis from near-impossible to routine.
36.
Zeolites still cannot be obtained in enantiopure form, which precludes their applications in catalytic asymmetric synthesis, e . g ., for the pharmaceutical, agrochemical, and fragrance industries.
37.
The asymmetric synthesis of the Wieland-Miescher ketone ( 1985 ) is another intramolecular reaction also based on proline, that was explored by the Barbas group in 2000.
38.
In another example of asymmetric synthesis the ?, ?-unsaturated carbonyl compound first reacts with a syn : anti ratio of 8 : 1 and 97 % enantiomeric excess.
39.
The asymmetric synthesis of ( " S " )-( + )-2-methyltetrahydrofuran can achieved by using a wool rhodium complex as a chiral catalyst for hydrogenation of methyl furan.
40.
One application of a ring-opening reaction in asymmetric synthesis is that of trimethylsilylazide with an asymmetric ligand in " scheme 2 " in an organic synthesis of oseltamivir:
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