SYNTHESIS, MOLECULAR-STRUCTURE AND REACTIVITY OF CIS-[PD(C6F5)2(C6H5CH2NME2-KC1, KN)] A COMPOUND DISPLAYING AN UNUSUAL ETA-1 ARENE-PALLADIUM INTERACTION

The reaction between cis-[Pd(C6F5)2(thf)2] (thf = tetrahydrofuran) and benzyldimethylamine rendered cis-[Pd(C6F5)2(C6H5CH2NMe2-kappaC1,kappa N)] 1, a four-co-ordinate compound containing an unusual eta1 arene-pa lladium interaction with the benzyldimethylamine acting as a bidentate chelating ligand. Complex 1 reacts with acetone, acetonitrile, dimeth yl sulfoxide or CO (L) to yield cis-[Pd(C6F5)2(NMe2CH2C6H5)(L)] 2-5 re spectively, which do not have a eta1 arene-palladium interaction. The reaction of 1 with Br- or SPMe2Ph (L') (molar ratio 1:1) produced the complete displacement of the amine and the formation of [(F5C6)2Pd(mu- L')2Pd(C6F5)2]n- (n = 2 or 0), and with Cl- (molar ratio 1:1) a mixtur e of complexes is formed. The crystal structures of compounds 1 and 2 have been determined.