Patent · US Expired

Preparation of rose oxide predominantly containing the Z isomer

US4429144A · kind A · utility

3Cited by

8References

1Claims

0Family size

Assignee

BASF SE

Inventor

Werner Hoffman · Schifferstadt, DE

Key dates

Filing date	Dec 9, 1982
Grant date	Jan 31, 1984
Priority date	—
Expiry date	Dec 9, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D309/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A mixture of Z- and E-2-[2-methylprop-1-en-1-yl]-4-methyltetrahydropyran isomers, of the formulae Z-I and E-I ##STR1## containing not less than 85% of Z-I and not more than 15% of E-I, is prepared by a process wherein 2-[2-methylprop-1-en-1-yl]-4-methylenetetrahydropyran of the formula II ##STR2## is hydrogenated over a platinum dioxide or platinum/charcoal catalyst in the presence of a strongly acidic cation exchanger. The product is a useful fragrance material which also occurs naturally and is known as rose oxide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.