Reactions of cis-[Os(CO)4Me2] and cis-[Re(CO)4(PPh3)Me] with anhydrous HF and HOTeF5; compatibiltiy of phosphine, alkyl and OTeF5– ligands in low-valent transition-metal complexes

Abstract

In the reactions of transition metal carbonyl methyls with HF or HOTeF₅ the elimination of methane has been shown to be a strong driving force in the formation of, for example, cis-[OsF₂(CO)₄], cis-[ReF(CO)₄(PPh₃)], cis-[Os(OTeF₅)(CO)₄Me] and cis-[Re(OTeF₅)(CO)₄(PPh₃)], which have been characterised by a combination of multinuclear NMR spectroscopic studies. These results also indicate that, with a suitable choice of metals and co-ligands, transition-metal teflate-phosphine and teflate-alkyl complexes can be prepared (teflate = OTeF₅^–).