ruthenium‐catalyzed ring‐closing metathesis (RCM) reactions of various [η5‐(ω‐alkenyl)cyclopentadienyl](ω‐alkenylphosphine)manganese(I) dicarbonyl complexes were examined. The RCM reaction between an η5‐allyl‐ or an η5‐vinyl‐cyclopentadienyl ligand and an allyldiphenylphosphine ligand in the manganese coordinationspheres gave the corresponding cyclized products in good to excellent yields. The X‐ray
PROCESS FOR THE MANUFACTURE OF A SATURATED ALCOHOL
申请人:DSM IP Assets B.V.
公开号:EP2924019A1
公开(公告)日:2015-09-30
The present invention relates to a process for the manufacture of a saturated primary alcohol from an unsaturated aliphatic ester comprising the steps of:
a) Providing an aliphatic ester having at least one carbon-carbon double bond;
b) Carrying out a metathesis of said ester in the presence of a ruthenium carbenebased catalyst thereby obtaining a first reaction mixture;
c) Adding a ligand and a base to the first reaction mixture, wherein the ligand comprises at least one donor atom chosen from the group consisting of a nitrogen atom and a phosphorus atom thereby obtaining a second reaction mixture comprising an ester product resulting from the metathesis reaction ;
d) Carrying out a homogeneous hydrogenation of the ester-product resulting from the metathesis, thereby obtaining a saturated primary alcohol.
Further, the present invention relates to a catalyst for the hydrogenation of esters and to a process for the hydrogenation of esters using said catalyst.
metathesis of the various Cs‐symmetric (π‐arene)chromium substrates provides the corresponding bridged planar‐chiral (π‐arene)chromium complexes in excellent yields with up to >99 % ee. With a bulky and unsymmetrical substituent, such as N‐indolyl or 1‐naphthyl, at the 2‐positions of the η6‐1,3‐diisopropenylbenzene ligands, both biaryl‐based axial chirality and π‐arene‐based planar chirality are simultaneously