A Rh-catalyzed isomerization of 1-alkenes to (E)-2-alkenes: from a homogeneous Rh/PPh3 catalyst to a heterogeneous Rh/POP-PPh3-SO3Na catalyst

An efficient Rh/PPh3 catalyst has been developed for the homogeneous isomerization of 1-alkenes to (E)-2-alkenes. Various alkenes are amenable to the protocol to afford the corresponding (E)-2-alkenes with high yields and good stereoselectivities. In order to address the problem of catalyst separation and recycling, a porous organic polymer supported rhodium catalyst (Rh/POP-PPh3-SO3Na) was synthesized for the heterogeneous isomerization of 1-alkenes. The heterogeneous catalyst showed a high activity, stereoselectivity and recyclability. Two possible mechanisms, namely, alkyl and allyl mechanisms, were involved in the olefin isomerization process.

Automated summary

An efficient Rh/PPh3 catalyst was developed for isomerization of 1-alkenes to (E)-2-alkenes, showing high yields and good stereoselectivities. A porous organic polymer supported rhodium catalyst (Rh/POP-PPh3-SO3Na) was synthesized to address catalyst separation and recycling issues, exhibiting high activity, stereoselectivity and recyclability. The olefin isomerization process involved two possible mechanisms, alkyl and allyl mechanisms.