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US 5,352,836 AGranted
Enantioselective lewis acid catalysts of the early transition metals
AssigneeE. I. Du Pont de Nemours and Company
InventorWilliam A. Nugent, Jr.
Life of this patent
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Abstract
Optically active Lewis acid catalysts of the early transition metals which are useful in the catalysis of asymmetric additions have been prepared. The catalyst complexes comprise an alkoxide of a group IV or group V metal and an optically active trialkanolamine or dialkanolamine ligand.
Claims4
An optically active trialkanolamine comprising formula (2) ##STR15## wherein:
- R.sup.1 is H or CH.sub.3 ;
- R.sup.2 and R.sup.3 are each independently C.sub.1 to C.sub.20 hydrocarbyl and may additionally have halogen, ether, or ester groups;
- provided that R.sup.1 is CH.sub.3 when R.sup.2 and R.sup.3 are each CH.sub.3.
Dependencies are inferred from the claim text.