Patent ID: 8288534

Claim:
A process for the preparation of compounds of formula I wherein: the dotted line signifies an optional bond; L is a neutral ligand; X 1 and X 2 are independently anionic ligands; Y 1 is hydrogen, C 1-6 -alkyl, C 3-8 -cycloalkyl, C 2-6 -alkenyl, C 2-6 -alkynyl, C 1-6 -alkoxy, C 2-6 -alkenyloxy, C 2-6 -alkynyloxy, aryloxy, C 1-6 -alkoxycarbonyl, C 1-6 -alkylthio, aryl, arylthio, C 1-6 -alkylsulfonyl or C 1-6 -alkylsulfinyl; a, b, c and d independently of each other have the meaning of hydrogen, C 1-6 -alkyl, halogen-C 1-6 -alkyl, C 2-6 -alkenyl, C 2-6 -alkynyl, C 1-6 -alkoxy, C 2-6 -alkenyloxy, C 2-6 -alkynyloxy, C 1-6 -alkylcarbonyl, aryl, hydroxy, aryloxy, nitro, C 1-6 -alkoxycarbonyl, amino, mono-C 1-6 -alkyl-or di-C 1-6 -alkylamino, halogen, thio, C 1-6 -alkylthio, arylthio, C 1-6 -alkylsulfonyl, C 1-6 -alkylsulfinyl, arylsulfonyl, SO 3 H, C 1-6 -alkylcarbonyl amino, aryl carbonyl amino, C 1-6 -alkyl sulfonyl amino, aryl sulfonyl amino, halogen-C 1-6 -alkyl sulfonyl amino, SO 3 â€”C 1-6 -alkyl or OSi(C 1-6 -alkyl) 3 and SO 2 â€”NRâ€²Râ€³ wherein Râ€² and Râ€³ are independently hydrogen, aryl or C 1-6 -alkyl or Râ€² and Râ€³ together with the N atom form a cyclic amine; R 1 and R 2 are independently hydrogen, C 1-6 -alkyl, C 3-8 -cycloalkyl, aryl or aryl-C 1-6 -alkyl; or, R 1 and R 2 together with the N atom form a 5 to 8 membered cyclic amine which may contain nitrogen, oxygen or sulfur as additional hetero atom; R 3â€² and R 3â€³ are independently hydrogen, C 1-6 -alkyl, C 3-8 -cycloalkyl, aryl, aryl-C 1-6 -alkyl, comprising contacting a Ru complex of formula II wherein: X 1 , X 2 and L are as defined above and Y 2 and Y 3 independently of each other are hydrogen, C 1-6 -alkyl, C 2-6 -alkenyl, C 2-6 -alkynyl, C 1-6 -alkylthio, aryl, arylthio, C 1-6 -alkylsulfonyl or C 1-6 -alkylsulfinyl, or, Y 2 and Y 3 taken together form a carbene of the type wherein G is hydrogen or aryl; or, Y 2 and Y 3 together form a vinyl or cumulenyl carbene of formula 2b or 2c: wherein R 4a , R 4b , R 4c , R 4d , R 4e independently of each other are hydrogen, C 1-6 -alkyl, C 1-6 -alkyloxy, aryl, aryloxy, halogen, C 1-6 -alkylcarbonyl amino or arylcarbonyl amino; with a compound of formula III wherein R 1 , R 2 , R 3â€² , R 3â€³ , Y 1 and a, b, c, d are as defined above; R x and R y are independently hydrogen, C 1-6 -alkyl optionally substituted by one or more halogen atoms, or, aryl optionally substituted by one or more halogen atoms or by C 1-6 -alkyl.