Abstract: | Preparation and Reactivity of Platinumcyclobutadiene Complexes PtCl2(C4R4)L] HPtCl3(C4H8)], prepared by reduction of H2PtCl6] with n-butanol reacts with 2-pentyne to give equal amounts of the regioisomers PtCl2(C4Et2Me2)] ( 3 a, 3 b ). An equimolar mixture of 2-butyne/3-hexyne reacts under the same conditions to give PtCl2(C4Me4)] ( 1 ), PtCl2(C4Et4)] ( 2 ) and PtCl2(C4Et2Me2)] ( 3 a ) in a molar ratio 1:1.3:6.6. 1 and 2 react with ligands L (L = py a , p-tol b , PPh3 c , AsPh3 d , SbPh3 e ) to give complexes of the type PtCl2(C4R4)L]. The complexes were characterized by microanalysis as well as by i.r., 1H- and 13C-n.m.r. spectroscopy. |