COORDINATION CHEMISTRY OF P-RICH PHOSPHANES AND SILYLPHOSPHANES - XVI- REACTIONS OF [ETA(2)-(P-(PBU2)-BU-T)PT(PPH3)(2)] AND [ETA(2)-(P-(PBU2)-BU-T)PT(DPPE)] WITH METAL-CARBONYLS - FORMATION OF A(2)-((CO)(5)M-CENTER-DOT(PPBU2)-BU-T)PT(PPH3)(2)] (M = CR, W) AND ETA(2)-((CO)(5)CR-CENTER-DOT(PPBU2)-BU-T)PT(DPPE)]

[eta(2)-{P-(PBu2)-Bu-t}Pt(PPh3)(2)] 4 reacts with M(CO)(5). THF (M = C r, W) by adding the M(CO)(5) group to the phosphinophosphinidene ligan d yielding [eta(2)-{(CO)(5)Cr . (PPBu2)-Bu-t}Pt(PPh3)(2)] 1, or [eta(2 )-{(CO)(5)W . (PPBu2)-Bu-t}Pt(PPh3)(2)] 2, respectively. Similarly, [e ta(2)-{P-(PBu2)-Bu-t}Pt(dppe)] 5 yields [eta(2)-{(CO)(5)Cr . (PPBu2)-B u-t}Pt(dppe)] 3. Compounds 1, 2 and 5 are characterized by their H-1- and P-31-NMR spectra, for 2 and 3 also crystal structure determination s were performed. 2 crystallizes in the monoclinic space group P2(1)/n (no.14) with a=1422.7(1)pm, b=1509.3(1)pm, c=2262.4(2)pm, beta=103.66 9(9)degrees. 3 crystallizes in the triclinic space group P (1) over ba r (no. 2) with a=1064.55(9) pm, b=1149.9(1) pm, c= 1693.2(1) pm, alpha = 88.020(8)degrees, beta= 72.524(7)degrees, gamma = 85.850(8)degrees.