Hard Ligands as Donors to Soft Metals. Part 3. Cationic Bis(solvent) Complexes of Palladium(II); Cations for Catalysis

Article abstract of DOI:10.1039/DT9800002246

Treatment of =Ph2PCH2CH2PPh2, with 2 equivalents of a silver(I) salt in the presence of a solvent ligand (solvent) leads to the formation of Y2 where Y=ClO4 or BF4.In this way stable complexes with solvent=pyridine, O-bonded dimethyl sulphoxide, dimethylformamide, benzonitrile, o-toluonitrile, acetone, or water as well as (solvent)2=1,6-dicyanohexane or o-phthalonitrile have been isolated and characterised.Complexes with solvent=methanol, ethanol, acetonitrile, or tetrahydrofuran are stable in solution; on attempted isolation the ethanol complex deposits palladium metal, the methanol and tetrahydrofuran perchlorate complexes yield the bis(perchlorato)-complexes , and the acetonitrile complex yield mainly 2 with a small amount of perchlorate-co-ordinated complex.The co-ordinated perchlorate ligands are readily displaced in solution by any of the solvent ligands; the bis(acetone) complex is very sensitive to moisture yielding 2 on exposure to air.Attempts to displace acetone from (2+) and perchlorate from by carbon monoxide failed.The solvent molecules dichloromethane and benzene do not form palladium(II) complexes of the present type; treatment of with 2 equivalents of silver(I) perchlorate in dichloromethane-benzene yields .Preliminary investigation of the catalytic abilities of these palladium(II) complexes has shown that 2 catalyses the hydrogenation of styrene to ethylbenzene at atmospheric pressure and 30 deg C, wich is remarkably high activity for palladium(II).

Full text of DOI:10.1039/DT9800002246

View Article Online / Journal Homepage / Table of Contents for this issue

View Article Online

View Article Online

View Article Online