Patent ID: 8003838
Filing Date: 2011-08-23
Classification: B01J,C07C,C07F

Abstract:
1. A process for the catalytic reduction by 1,4-hydrogenation, using molecular H 2 , of a C 5 -C 22 conjugated diene of formula wherein R one of R R into the corresponding alkene, of formula wherein R wherein said process is carried out in the presence of at least one ruthenium catalyst or pre-catalyst of formula wherein L represents a C5-C25 substituted cyclopentadienyl ligand, Diene represents a C4-C22 diene and X represents a non coordinated anion, n represents 2, 1 or 0 and L′ represents a solvent; and at least an acidic additive selected from the group consisting of: a compound of formula R a boron derivative of formula R phenol or a phenol substituted by up to three C a C a HOOCCH═CHCOOH di-acid, and the tetronic acid; provided that the processes wherein compound (I) is sorbol and compound (III) is of formula [Ru(Cp*)(COD)]X are excluded.