Patent ID: 9370772
Filing Date: 2016-06-21
CPC Classification: B01J,C07C

Claim Text:
1. A method for the partial hydrogenation of 6-hydroxy-3-(5-hydroxy-3-methyl-pent-3-in-1-ynyl)-2,4,4-trimethylcyclohex-2-enone to 6-hydroxy-3-(5-hydroxy-3-methyl-penta-1,3-dienyl)-2,4,4-trimethylcyclohex-2-enone, the method comprising: (a) subjecting 6-hydroxy-3-(5-hydroxy-3-methyl-pent-3-in-1-ynyl)-2,4,4-trimethylcyclohex-2-enone to conditions of at least partial hydrogenation in the presence of a Lindlar-type catalyst which comprises, based on total weight of the catalyst: (b) obtaining 6-hydroxy-3-(5-hydroxy-3-methyl-penta-1,3-dienyl)-2,4,4-trimethylcyclohex-2-enone from the partial hydrogenation conditions of step (a) at a selectivity of greater 90%.