The reactivity of complexes 3 and 4 was tested against a variety of small molecules such as PMe 3 , benzophenone imine, H 2 , CO 2 , 1octene, benzonitrile, 4-fluorophenyl acetylene, diethylsilane and diphenylsilane (Table ). What we observe for many of these substrates is that at room temperature there is no reaction, while at high temperature, there is some reactivity which then also leads to formation of intractable mixtures. The latter is often associated by a decrease of signal intensity in the 1 H NMR spectrum, indicative for the formation of paramagnetic decomposition products alongside various diamagnetic products observed in the NMR spectrum.