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US 6,187,953 B1Granted
Guanidinium phosphanes, their production and their use
AssigneeCelanese Corporation
InventorsOthmar Stelzer, Franz Peter Schmidtchen, Antonella Hessler, Michael Tepper, Harald Dibowski, Michael Riedel, Helmut Bahrmann
Life of this patent
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Abstract
Guanidinium phosphanes of Formula I wherein the substituents are defined as in the specification which are useful catalyst ligands for the carbon-carbon linkage reactions of the hect reaction.
Claims9
A compound o the formula
- wherein n is an integer of 1 to 3, X is selected from the group consisting of chlorine, bromine, iodine and PF6, R1 and R2, are hydrogen and R3 and R4 are methyl or R1 and R2 are methyl and R3 and R4 are hydrogen, R5 is phenyl and the guanidinium is located meta or para with respect to the phosphorus atom.
A compound of the formula
- wherein n is 1 or 2, X is selected from the group consisting of chlorine, bromine, iodine and PF6, R1, R2, R3 and R4 are individually hydrogen or alkyl of 1 to 6 carbon atoms with the proviso that R1 and R2 are not hydrogen when R3 and R4 are methyl or R1 and R2 are not methyl when R3 and R4 are hydrogen, R5 is phenyl and the quanidinium is meta or para with respect to the phosphorus atom.
Dependencies are inferred from the claim text.