Abstract
In 1964, a team of Russian chemists reported an experiment in which they treated a palladium salt with triphenylcyclopropenium chloride and ethylene. They proposed a product structure consisting of a Pd3Cl4 chain capped by two cyclopropenyl ligands. When Christian Jandl, Karl Ofele, and Alexander Pothig of Technical University of Munich recently noticed that some reactions of cyclopropenium ions with transition metals result in ring opening and formation of four-membered metallacycles, they became interested in the actual structure of the 1964 molecule and wanted to know more about cyclopropenium’s reactivity. The Munich team repeated the originally reported synthesis and found out with the benefit of today’s analytical tools that the actual molecule is a more complex Pd6Cl8 cluster capped by triphenylpropyl ligands (Organometallics 2017, DOI: 10.1021/acs.organomet.7b00525). The researchers believe the ring-opened ligand forms in a two-step process involving the partial reduction of Pd(II) to Pd(0) by eth...
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