Nucleophilic attack on olefins co-ordinated to platinum. Part 3. Effect of substituents on the olefins on the formation of 2-ammonioethanide compounds (H3NCHRCHR′–Pt), of four-membered ring complexes, and of five-co-ordinate species

A study has been made of the attack of amines on platinum complexes containing ethene derivatives. When 2-ammonioethanide compounds (H3NCHRCHR′–Pt) are formed, the direction of attack is determined by electronic rather than steric effects unless the latter are very large. Reactions are not complete, and equilibrium constants show that steric factors tend to prevent the formation of the 2-ammonioethanide compounds. The production of azaplatinacyclobutane ring complexes is enhanced by steric factors. Five-co-ordinate species are formed in some cases. Hydrogen-1 n.m.r. data are reported.