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

摘要

t322t32t3221232t32The 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)(PBu)]. The method is based on a comproportionation reaction in which a Pd(ll) compound (= PdBr) is reacted with a Pd(0) compound (= Pd(PBu)) in organic solvents to yield the [Pd(µ Br)(PBu)] compound having the Pd atoms in the formal oxidation state +l. Unreacted PdBr 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 R C(O) O CH(R) C(R)=CH employing the compound Pdµ Br)(PBu)] as a catalyst is disclosed.