A new type of pyrrole co-ordination : µ3-pyrrole-2,3-diyl triosmium complexes

Abstract

Pyrrole reacts with [Os₃(CO)₁₂] in refluxing decalin to give [Os₃H₂(CO)₉(µ₃-C₄H₂NH)](yield 54%) which is analogous to the benzene derivative [Os₃H₂(CO)₉(µ₃-C₆H₄)] and is not related to known pyrrolyl complexes such as [Fe(η⁵-C₅H₅)(η⁵-C₄H₄N)] in which the pyrrolyl is deprotonated at nitrogen. N-Methylpyrrole forms a directly related compound differing, however, in its much faster exchange of the hydrido-ligands.