METHOD FOR THE PREPARATION OF PALLADIUM(I) TRI-TERT-BUTYLPHOSPHINE BROMIDE DIMER AND PROCESS FOR ITS USE IN ISOMERIZATION REACTIONS

摘要

The invention provides a new method for the preparation of the dimeric Pd(l) tri - terf.-butylphosphine bromide complex, characterized by the chemical formula [Pd(µ-Br)(P t Bu3)]2. The method is based on a comproportionation reaction in which a Pd(ll) compound (= PdBr2) is reacted with a Pd(0) compound (= Pd(P t Bu3)2) in organic solvents to yield the [Pd(µ-Br)(P t Bu3)]2 compound having the Pd atoms in the formal oxidation state +l. Unreacted PdBr2 may be reused in the process. The method is straightforward and applicable for industrial scale production and provides high product yields. Further, a new process for the isomerization of allyl ethers of the general type R1-C(O)-O-CH(R2)-C(R3)=CH2 employing the compound Pdµ-Br)(P t Bu3)]2 as a catalyst is disclosed.