| abstract |
The invention relates to a process for forming a trisubstituted ethylene compound, the process comprising the steps of: (A) providing a trisubstituted ethylene compound having a first, a second and a third substituent, wherein the first and the second substituent are bonded to the olefinic carbon atom and are different from each other; (B) providing a monosubstituted ethylene compound or a disubstituted ethylene compound wherein the substituents are vicinal bonded to olefinic carbon atoms bearing at least a fourth substituent, respectively; (C) subjecting the trisubstituted ethylene compound provided in step (A) to a cross-metathesis reaction with olefin provided in step (B) to form said trisubstituted ethylene, the cross metathesis reaction being catalyzed by a transition metal complex carrying ligands from which a ligand is a carbene ligand, the carbene complex being characterized by a M = C moiety, M being the transition metal; and the reaction taking place stereoselectively. |