PREPARATION AND PROPERTIES OF TWO PENTACARBONYLTUNGSTEN COMPLEXES OF SUBSTITUTED CYCLOPROPENYLIDENES

Article abstract of DOI:10.1016/S0022-328X(00)93334-5

2,3-Diphenylcyclopropenylidene(pentacarbonyl)tungsten and 2,3-di-t-butylcyclopropenylidene(pentacarbonyl)tungsten have been prepared by the method of Oefele for comparison with cycloheptatrienylidene, diphenylcarbene and phenylmethoxycarbene complexes of pentacarbonyltungsten.Both the cycloheptatrienylidene and cyclopropenylidene complexes are poorer ?-acceptors than the other carbene complexes.Furthermore there is some evidence that cyclopropenylidene is a poorer acceptor than cycloheptatrienylidene although this is not conclusive.Both of the cyclopropenylidene complexes show greater thermal stability and lower chemical reactivity than the cycloheptatrienylidene complex.