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Issue 11, 2010
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Construction of a monoanionic S,N,S-pincer ligand with a pyrrole core by sequential [1,2] phospho-Fries rearrangement. Characterization of palladium and silver coordination complexes

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Abstract

The synthesis of an S,NH,S-pincer ligand possessing a pyrrole core and two O,O-diethylthiophosphonyl groups to design P[double bond, length as m-dash]S lateral coordination sites is reported. The synthetic procedure to produce this ligand makes use of the nitrogen atom of the pyrrole heterocycle to successively functionalize the ortho-positions with the two O,O-diethylthiophosphonyl moieties. The ortho-functionalization arises from a repetition of a [1,2] base-induced rearrangement allowing the transformation of O,O-diethyl-N-pyrollylthiophosphoramidate to ortho-thiophosphonate. The coordination properties of this tridentate S,NH,S-ligand have been investigated with silver and palladium metals. Reaction of the monoanionic S,N,S-pincer ligand 4 (O,O,O,O-tetraethylpyrrol-2,5-yl-dithiophosphonate) with PdCl2(MeCN)2 at room temperature in the presence of triethylamine gives rise to the formation of the η3-complex [Pd(η3-4′)Cl] 5. Ligand 4 also reacts with silver oxide in dichloromethane to produce complex 6 which, in the solid state, exists as a tetramer involving an almost linear arrangement of four silver atoms.

Graphical abstract: Construction of a monoanionic S,N,S-pincer ligand with a pyrrole core by sequential [1,2] phospho-Fries rearrangement. Characterization of palladium and silver coordination complexes

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Publication details

The article was received on 06 Nov 2009, accepted on 22 Dec 2009 and first published on 05 Feb 2010


Article type: Paper
DOI: 10.1039/B923351B
Dalton Trans., 2010,39, 2942-2946

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    Construction of a monoanionic S,N,S-pincer ligand with a pyrrole core by sequential [1,2] phospho-Fries rearrangement. Characterization of palladium and silver coordination complexes

    A. Fraix, M. Lutz, A. L. Spek, R. J. M. K. Gebbink, G. van Koten, J. Salaün and P. Jaffrès, Dalton Trans., 2010, 39, 2942
    DOI: 10.1039/B923351B

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