Selective telomerisation of isoprene with methanol by a heterogeneous palladium resin catalyst
Abstract
High catalytic activity for the telomerisation of isoprene with methanol with an unusual regioselectivity towards tail-to-tail telomerisation products was achieved with a heterogeneous (DVB-resin-PPh3-Pd-dvds) catalyst synthesised by supporting palladium-(dvds) on a commercial triphenylphosphine–divinylbenzene resin, with potential for continuous operation. The high activity is a function of the presence of the (dvds) ligand while the regioselectivity is attributed to the combination of (dvds) and PPh3 ligands associated with the palladium centre. The loss of activity upon recycling the catalyst is due to the loss of associated (dvds) ligand during reaction and during the recycle process.