Method for the preparation of palladium(I) tri-tert-butylphosphine bromide dimer and process for its use in isomerization reactions
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United States of America Patent
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Nov 24, 2015
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Jul 3, 2014
app pub date -
Jun 25, 2012
filing date -
Jun 29, 2011
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Abstract
The invention provides a new method for the preparation of the dimeric Pd(l) tri-tert.-butylphosphine bromide complex, characterized by the chemical formula [Pd(μ-Br)(PtBu3)]2. The method is based on a comproportionation reaction in which a Pd(ll) compound (═PdBr2) is reacted with a Pd(0) compound (═Pd(PtBu3)2) in organic solvents to yield the [Pd(μ-Br)(PtBu3)]2 compound having the Pd atoms in the formal oxidation state +1. 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)(PtBu3)]2 as a catalyst is disclosed.
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