803733-84-8Relevant academic research and scientific papers
Branched and dendritic metallo-carbosiloxanes with OCH2 PPh2MLn end-grafted units
Lang, Heinrich,Lühmann, Bettina,Buschbeck, Roy
, p. 3598 - 3603 (2004)
A straightforward method for the preparation of metallo carbosiloxanes of type Si(OCH2CH2SiMe2[OCH2 PPh2M(CO)n])4 (n = 3, M = Ni, 7a; n = 4, M = Fe, 7b; n = 5: M = Mo, 7c; M = W, 7d), Si(OCH2 CH2CH2SiMe[OCH2PPh2Ni (CO)3]2)4 (8) and Me2 Si(OCH2CH2CH2SiMe[OCH2 PPh2Ni(CO)3]2)2 (11) is described. The reaction of Si(OCH2CH2CH2 SiMeXCl)4(1: X = Me, 2: X = Cl) or Me2 Si(OCH2CH2CH2SiMeCl2) 2)2 (9) with HOCH2PPh2 (3) produces Si(OCH2CH2CH2SiMe2 (OCH2PPh2))4 (4), Si(OCH2 CH2CH2SiMe(OCH2PPh2) 2)4 (5) or Me2Si(OCH2 CH2CH2SiMe(OCH2PPh2) 2)2 (10) in presence of DABCO. Treatment of the latter molecules with Ni(CO)4 (6a), Fe2 (CO)9 (6b), M(CO)5 (Thf) (6c: M = Mo; 6d: M = W), respectively, gives the title compounds 7a-7d, 8 and 11 in which the PPh2 groups are datively bound to a 16-valence-electron metal carbonyl fragment. The formation of analytical pure and uniform branched and dendritic metallo-carbosiloxanes is based on elemental analysis, and IR, 1H, 13C{1H}, 29Si {1H} and 31P{1H} NMR spectroscopic studies. In addition, ESI-TOF mass spectrometric studies were carried out.
