Title of Invention

PROCESS FOR THE MANUFACTURE OF DIHYDROCITRAL

Abstract

Abstract A process for the manufacture of dihydrocitral by the catalyzed rearrangement of dihydrodehydrolinalool comprises carrying out the rearrangement in the presence of a molybdenum compound of the general formula M0O2X2 I wherein X signifies an acetylacetonate or halide ion, and a dialkyl or diaryl sulphoxide as the catalyst system, in the presence of an organic acid having a pK value in the range of about 4.0 to about 6.5 and in an aprotic organic solvent. Dihydrocitral is a valuable intermediate.

Full Text

Ind.Class - 32-B Intel."* - C 07 C 47/21 "PROCESS FOR THE MANUFACTURE OF DIHYDROCITRAL" Applicant: F HOFFMANN-LA ROCHE AG, 124, Grenzacherstrasse, CH-4070 Basle, Switzerland, a Swiss Company. Inventor: WERNER B(5RATH, (GERMANY) Application No. 381/MAS/99 Dated: April 01, 1999. Appropriate Office for Opposition Proceedings (Rule 4, Patents Rules, 1972), Patent Office, Chennai Branch. 11 Claims A process for the manufacture of dihydrocitral by the catalytic rearrangement of dihydrodehydrolinalool to dihydrocitral which process comprises carrying out the rearrangement in the presence of 0.1-8 mol%, based on the amount of dihydrodehydrolinalool employed, of a molybdenum compound of the general formula M0O2X2 I wherein X signifies an acetylacetonate rbr halide ion, and a dialkyl or diaryl sulphoxide as the catalyst system, in the presence of an organic acid having a pK value in the range of 4.0 to 6.5, in an apolar aprotic organic solvent, and at temperatures in the range of 80°C to 140°C. Ref cited: INDIAN PATENT APPLN. No. 353/MAS/99 Agents: M/s. DePening & DePenning (Com. - 12 pages) cr No. "PROCESS FOR THE MANUFACTURE OF DIHYDROCITRAL" APPLN.NO. 381/MAS/99 Dated: 1-4-2999 Ind.Class - 32-B Int.Cl.'- APELICANTs F HOFFMANN -LA ROCHE AG, (SWISS) A process for the manufacture of dihydrocitral by the catalytic rearrangement of dihydrodehydrolinalool to dihydrocitral which process comprises carrying out the rearrangement in the presence of 0.1 -8 mol%, based on the amount of dihydrodehydrolinalool employed, of a molybdenum compound of the general formula wherein X signifies an acetylacetonate O^halide ion, and a dialkyl or diaryl sulphoxide as the catalyst system, in the presence of an organic acid having a pK value in the range of 4.0 to 6.5, in an apolar aprotic organic solvent, and at temperatures in the range of 80°C to 140°C. Ref cited: INDIAN PATENT APPLN. No. 353/MAS/99 cr 11 Claims A process for the manufacture of dihydrocitral by the catalytic rearrangement of dihydrodehydrolinalool to dihydrocitral which process comprises carrying out the rearrangement in the presence of 0.1-8 mol%, based on the amount of dihydrodehydrolinalool employed, of a molybdenum compound of the general formula Mo02X2 I wherein X signifies an acetylacetonate ;br halide ion, and a dialkyl or diaryl sulphoxide as the catalyst system, in the presence of an organic acid having a pK value in the range of 4.0 to 6.5, in an apolar aprotic organic solvent, and at temperatures in the range of 80°C to 140°C. Ref.cited: INDIAN PATENT APPLN. No. 353/MAS/99 Agents: M/s. DePening & DePenning (Com. - 12 pages) cr

Documents:

0381-mas-1999 abstract.pdf

0381-mas-1999 claims.pdf

0381-mas-1999 correspondence-others.pdf

0381-mas-1999 correspondence-po.pdf

0381-mas-1999 description (complete).pdf

0381-mas-1999 form-1.pdf

0381-mas-1999 form-26.pdf

0381-mas-1999 form-4.pdf

0381-mas-1999 form-6.pdf

0381-mas-1999 petition.pdf