Process for the preparation of cyclohexyloxyacetic alkyl esters
View Patent ↗The invention relates to a process for the preparation of cyclohexyloxyacetic alkyl esters by hydrogenation of phenoxyacetic alkyl esters and to the use of cyclohexyloxyacetic alkyl esters as fragrances.
1. A process for the preparation of cyclohexyloxyacelic alkyl esters comprising the step of hydrogenating phenoxyacetic alkyl esters in the presence of a catalyst comprising at least one metal from subgroup 8 in elemental form.
2. A process according to claim 1 , wherein the catalyst comprises palladium, platinum, ruthenium, and rhodium.
3. A process according to claim 2 , wherein the catalyst comprises palladium.
4. A process according to claim 1 wherein the catalyst comprises at least one inorganic support material.
5. A process according to claim 4 , wherein the catalyst is palladium on activated carbon.
6. A process according to claim 1 , wherein the weight ratio of the amount of metal to phenoxyacetic alkyl ester is in the range 1:100 to 1:10,000.
7. A process according to claim 1 , wherein hydrogenation is carried out in the absence of a solvent.
8. A process according to claim 1 , wherein the hydrogen pressure is 1 to 100 bar.
9. A fragrance comprising one or more cyclohexyloxyacetic alkyl esters, having alkyl radicals containing 1 to 5 carbon atoms and having a fruity character.