The coordination of B(C6F5)3 to an oxo ligand in tungsten oxo alkylidene bis(aryloxide) complexes, where the aryloxide is O-2,6-(mesityl)2C6H3(HMTO) or 2,6-diadamantyl-4-methylphenoxide (dAdPO), accelerates the formation of metallacyclobutane complexes from alkylidenes as well as the rearrangement of metallacyclobutane complexes.
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B(C6F5)3 Activation of Oxo Tungsten Complexes That Are Relevant to Olefin Metathesis
(Dmitry V. Peryshkov, and Richard R. Schrock et al, Organometallics 2013, 32, 5256−5259)