Novel cyclometallated Pd(II) and Pt(II) complexes with indole derivatives and their use as catalysts in heck reaction
Articolo
Data di Pubblicazione:
2005
Citazione:
Novel cyclometallated Pd(II) and Pt(II) complexes with indole derivatives and their use as catalysts in heck reaction / G. Cravotto, F. Demartin, G. Palmisano, A. Penoni, T. Radice, S. Tollari. - In: JOURNAL OF ORGANOMETALLIC CHEMISTRY. - ISSN 0022-328X. - 690:8(2005), pp. 2017-2026.
Abstract:
Several palladacycle and platinacycle complexes have been prepared from easily available or naturally occurring indole derivatives, such as gramine and related compounds. Dimeric complexes were obtained with Pd(OAc)(2), while Pt(DMSO)(2)Cl-2 mainly afforded monomeric structures. A notable feature of these reactions was the formation of new M-C bonds between Pd or Pt and C-2 and C-3 of the indole ring. With ligands like 2-(2'-pyridyl)-1H-indoles, N-N metallacycles were generated instead: in fact new C-M bonds with the C-3 position could only form if N-substituted indoles were used. The reactivity of Pd dimeric complexes with PPh3, sym-collidine and DMAP was explored to obtain monomeric complexes. Three such compounds were prepared, one of which was characterized by X-ray diffraction. Metathetical reactions were carried out to effect a ligand exchange replacing OAc with halide ions, with the aim to synthesize mu-Cl and mu-Br bridged structures. Turning to the synthesis of hetaryl complexes, functionalization of the C-2 position on the indole ring was achieved. These complexes were prepared by substitution reactions starting from gramine and/or its alkylammonium salts. (c) 2004 Elsevier B.V. All rights reserved.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Catalysis; Heck reaction; Indole derivatives; Metallacycles; Palladium; Platinum
Elenco autori:
G. Cravotto, F. Demartin, G. Palmisano, A. Penoni, T. Radice, S. Tollari
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