The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 1997
Filed:
May. 19, 1995
Emil A Broger, Magden, CH;
Robert K M uller, Basle, CH;
Hoffmann-La Roche Inc., Nutley, NJ (US);
Abstract
There is described a process for the manufacture of isoprene derivatives of the general formula ##STR1## wherein the asymmetric centres can each individually have the (R)- or (S)-configuration, R represents a residue of the formulae ##STR2## R.sup.1 signifies lower alkyl or both R.sup.1 's together signify ethylene or propylene and n stands for the number 0, 1 or 2, in which a compound, which is present in the (E)- or (Z)-form, of the general formula ##STR3## wherein R, n and an optionally present asymmetric centre have the above significance, is asymmetrically hydrogenated with a ruthenium complex of an optically active atropisomeric diphosphine.