The order of relative basic strengths, THF > trans-[ReCl(N2)(PMe2Ph)4] > trans-[Mo(N2)2(dpe)2] > trans-[W(N2)2(dpe)2] > trans-[ReCl(N2)(PMe2Ph)2{P(OMe)3}2] > trans-[ReCl(CO)(PMe2Ph)4] > Et2O > mer-[OsCl2(N2)(PEt2Ph)3](THF = tetrahydrofuran, dpe = Ph2PCH2CH2PPh2) towards trimethylaluminium in benzene has been deduced from 1H n.m.r. studies of the equilibrium between trimethylaluminium, the above compounds, and Et2O.
J. Chatt, R. H. Crabtree and R. L. Richards, J. Chem. Soc., Chem. Commun., 1972, 534 DOI: 10.1039/C39720000534
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