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2.4.3 Method 3: Synthesis of Metal–Bis(arene) Complexes by Arene Exchange, by Arene Transformation Reactions, and by Cyclic Condensation Reactions

DOI: 10.1055/sos-SD-002-00214

Kündig, E. P.; Pache, S. H.Science of Synthesis, (20032158.

Reversible arene exchange occurs in [Cr(arene)2]+ complexes in the presence of aluminum trihalides.[‌26‌] The zero-valent chromium sandwich complexes are generally inert to thermal arene exchange.[‌27‌] An exception is bis(naphthalene)chromium(0) (2, M=Cr), which exchanges one naphthalene ligand for another arene at temperatures of 80°C (in the presence of tetrahydrofuran) or 150°C (in the neat arene) to give the mixed sandwich complexes.[‌27‌] Both arene ligands in bis(η6-benzene)molybdenum(0) are exchanged when heated under vacuum in a sealed tube at 160°C for two days in neat alkylbenzene (alkyl = Et, iPr, t-Bu). Yields are 6070%.[‌367‌]

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