Pyridine-2-carboxaldehyde as ligand: synthesis and derivatization of carbonyl complexes.
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(eta3-methallyl)Cl(CO)2(NCMe)2] produce stable crystalline complexes containing pyridine-2-carboxaldehyde (pyca) as chelate kappa2(N,O) ligands (). These react with ethylglycine to afford iminopyridine complexes containing an amino ester pendant arm in high-yield. Treatment with silver salts produce halide abstraction affording neutral complexes containing coordinated perchlorate or triflate which can be replaced by triphenyl phosphine to give cationic complexes . As confirmed by spectroscopy and X-ray crystallography the pyca ligand remains bonded as chelate kappa2(N,O) throughout these processes.
IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, C/Prado de la Magdalena s/n. 47005, Valladolid. Spain.
Celedonio M
CM
Alvarez
Raúl
R
García-Rodríguez
Daniel
D
Miguel
D000447:Aldehydes / Q000138:chemical synthesis* / Q000737:chemistry*; D008024:Ligands; D046911:Macromolecular Substances / Q000138:chemical synthesis / Q000737:chemistry; D015394:Molecular Structure; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry; D012996:Solutions / Q000737:chemistry
D000447:Aldehydes; D008024:Ligands; D046911:Macromolecular Substances; D011725:Pyridines; D012996:Solutions; C523774:pyridine-2-carboxaldehyde