OBSERVATION OF A NON-H-BOND-STABILIZED TAUTOMERIC IMINE-ENAMINE EQUILIBRIUM IN IMINOACYL-PALLADIUM COMPLEXES

Iminoacyl complexes of the type trans-Pd-(C(=NBu(t))(CH2C6H4-p-X))Cl(P R(3))(2) exist in solution as equilibrium mixtures of their imine and enamine forms. The position of the equilibria can, be tuned by varying the X substituent of the aryl ring and the phosphine ligands, allowin g in some cases the isolation of compounds that exist as the less comm on enamine form, both in solution and in, the solid state.