Synthesis of a new potentially hemilabile ligand: 1-[2-(diphenylphosphanyl)ethyl]-3,5-dimethylpyrazole, and comparison of its bonding properties with the related 1-[2-(ethylamino)ethyl]-3,5-dimethylpyrazole ligand toward RhI

Glòria Esquius, Josefina Pons, Ramón Yáñez, Josep Ros, René Mathieu, Bruno Donnadieu, Noël Lugan

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Abstract

The new ligand 1-[2-(diphenylphosphanyl)ethyl]-3,5-dimethylpyrazole (2) has been prepared by the reaction of 1-(chloroethyl)-3,5-dimethylpyrazole and PPh2Li. The bidentate N,N ligand 1-[2-(ethylamino)ethyl]-3,5-dimethylpyrazole (1) and 2 react with [Rh(COD)(THF)2][BF4] to give [Rh-(COD)(1)][BF4] (3) and [Rh(COD)(2)][BF4] (4), respectively. Substitution of 1,5-cyclooctadiene with carbon monoxide in the latter complexes generates [Rh(CO)2(1)][BF4] (5) and [Rh(CO)2(2)][BF4] (6), respectively. Treatment of Rh(COD)(THF)2][BF4] with two equivalent amounts of 2 results in the complex [Rhf2)2][BF4] (7), which converts to [Rh(CO)(2)2][BF4] (8) on reaction with carbon monoxide. Ligand 2 in complex 8 exhibits a hemilabile character. The single-crystal X-ray structures of 3, 4, and 7 are reported. © Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.
Original languageEnglish
Pages (from-to)2999-3006
JournalEur. J. Inorg. Chem.
Issue number11
DOIs
Publication statusPublished - 1 Nov 2002

Keywords

  • Hemilabile ligands
  • Hydroformylations
  • N ligands
  • P ligands
  • Rhodium

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