Metallo-organic compounds containing metal–nitrogen bonds. Part V. Dialkylamidopyrrolyl- and dialkylamido-2,5-dimethyl-pyrrolyltitanium compounds

Abstract

Addition of pyrrole to Ti(NR₂)₄(R = Me, Et, Prⁿ, or Buⁿ) gave preferentially disubstitution: Ti(NR₂)₄+ 2C₄H₄NH→Ti(NC₄H₄)₂(NR₂)₂+ 2R₂NH. The bis(dialkylamidobispyrrolyltitanium compounds so formed were highly reactive and unstable, could be distilled in vacuo, and are believed to contain π-bonded pyrrolyl groups. Prolonged treatment with an excess of pyrrole led to replacement of all diethylamido-groups and the formation of a remarkable black ‘titanated polypyrrole’ product. With 2,5-dimethylpyrrole and Ti(NR₂)₄(R = Me or Et) the products obtained were Ti(NC₄H₂Me₂)₂(NMe₂)₂ and Ti(NC₄H₂Me₂)(NEt₂)₃. No reaction occurred with Ti(NPr₂ⁿ)₄.