A simple and efficient synthesis of bisphosphine platinum(0) complexes with various P-Pt-P angles

mproved syntheses of a series of [(L)(2)Pt(eta(2)-nb)] (4)-(8) (L = PPh3, 1/2 dpp(o-xyl), 1/2 dppb, 1/2 dppbe, 1/2 dppn) complexes are described. Complexes 4-8 have been characterized by H-1, P-31 NMR, IR spectroscopy as well as mass spectrometry and elemental analysis. The reaction of [(dppbe)Pt(Cl-2)] with sodium borohydride and tolan was investigated by P-31 NMR spectroscopy. The complex [(dppbe)Pt(eta(2)-tolan)] (11) has been isolated and characterized. The reactivity of [(dppn) Pt(eta(2)-nb)] with the spirocyclohexyl-1,2,4-trithiolane 12 and the sterically hindered 2,2,4,4-tetramethyl-3-thioxocyclobutanone 13 was tested. The complex [(dppn)Pt(eta(2)-13)] (14) has been isolated and characterized by H-1, P-31 NMR, IR spectroscopy as well as mass spectrometry and elemental analysis. X-ray crystal analyses have been performed on complex 8, 11 and 14. (c) 2006 Elsevier B.V. All rights reserved.