Highly Active Ethene Polymerization Catalysts with Unusual Imine Ligands - Late Transition Metal Polymerization Catalysis - page 70

Fig. 3.4 Steric extension of 2,6-dibromo- (left), 2,6-diisopropyl-aniline (right) and overlay, front
and side views.

Scheme 3.4

Synthesis of N,N-{2,3-bis(2,6-dibromophenylimine butane)}palladium dichloride.

phenyl diimines readily react to give a catalyst precursor. However, the bisacetoni-
trile adduct of palladium dichloride reacted cleanly with 38 and the resulting
(N,N)PdCl 2 ( 39 ) was characterized by single crystal X-ray diffraction (Fig. 3.5).
This compound was methylated with tetramethylstannane to give the mono-
methyl palladium derivative 40 . For the alkylation to proceed, tetramethylammo-
nium chloride was added as a catalyst [27].