Metathesis polymerisation of norbornene and its derivatives. Relative stability of tungstacyclobutane intermediates and kinetics of their ring opening to form tungsten–carbene complexes

Abstract
A family of tungstacyclobutane intermediates in the catalytic ring-opening polymerisation of norbornenes have been studied by 1H n.m.r.; their rates of rearrangement into tungsten–carbene complexes are reported and compared.

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