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Issue 32, 2007
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Pyridine-2-carboxaldehyde as ligand: Synthesis and derivatization of carbonyl complexes

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Abstract

Thermally induced carbonyl substitutions on [M(CO)5X] (M = Mn, X = Cl, Br; M = Re, X = Br) or room temperature displacement of acetonitrile from [Mo(η3-methallyl)Cl(CO)2(NCMe)2] produce stable crystalline complexes containing pyridine-2-carboxaldehyde (pyca) as chelate κ2(N,O) ligands (1a–d). These react with ethylglycine to afford iminopyridine complexes 2a–d containing an amino ester pendant arm in high-yield. Treatment with silver salts produce halide abstraction affording neutral complexes 3a–d containing coordinated perchlorate or triflate which can be replaced by triphenyl phosphine to give cationic complexes 4a–d. As confirmed by spectroscopy and X-ray crystallography the pyca ligand remains bonded as chelate κ2(N,O) throughout these processes.

Graphical abstract: Pyridine-2-carboxaldehyde as ligand: Synthesis and derivatization of carbonyl complexes

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Article information


Submitted
15 Feb 2007
Accepted
24 May 2007
First published
28 Jun 2007

Dalton Trans., 2007, 3546-3554
Article type
Paper

Pyridine-2-carboxaldehyde as ligand: Synthesis and derivatization of carbonyl complexes

C. M. Alvarez, R. García-Rodríguez and D. Miguel, Dalton Trans., 2007, 3546
DOI: 10.1039/B702418E

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