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A study has been made of the attack of amines on platinum complexes containing ethene derivatives. When 2ammonioethanide compounds ( H3NCH RCHR'-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 cpnstants show that steric factors tend to prevent the formation of the 2-ammonioethanide compounds. The production of araplatinacyclobutane ring complexes is enhanced by steric factors. Five-co-ordinate species are formed in some cases. Hydrogen-1 n.m.r. data are reported.2.85 (t) 1.96 (t) J(lS5Pt-H) = 40 HZ J(ls5Pt-H) = 86 HZ cis-But-2-ene CI NHMe, 3.28 (c) 2.4 (c) CH,=CHCN Y-2 = acac 2.8-3.05 (c) 3.56 (c) CH,=CDCN Y-2 = acac 2.8 (d), 3.0 (d) J(lS5Pt-H) = 60 H Z J(lS5Pt-H) = 120 H Z J(lU5Pt-H) = 60 HZ CH,=CIICOOMe Y-2 = acac 2.9-3.0 (c) 4.12 (c) J(lS5Pt-H) = 80 H Z J(lS5Pt-H) = 132 H Z * Solvent: CDC1,; chemical shifts are given as 6 values in p.p.m.; abbreviations: s = singlet, d = complex multiplet.

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