Metallo-Carbosiloxan-Dendrimere mit Titanocendichlorid-Endgruppen

The synthesis of titanocenedichloride end-grafted carbosiloxane dendrimers of the 1st and 2nd generation is reported. To find the optimal reaction conditions, Me2ClSiH (1) was reacted with (η5-C5H4SiMe2CHdouble bond; length as m-dashCH2)(η5-C5H5)TiCl2 (2). The best result could be obtained with the Karstedt catalyst, whereby exclusively the β-isomer ((η5-C5H4SiMe2CH2CH2SiMe2Cl)(η5-C5H5)TiCl2, 3) is formed. Under similar conditions Me3SiOCH(Me)(CH2)4SiMe2H (4) reacts with 2 to give (η5-C5H4SiMe2CH2CH2SiMe2(CH2)4CH-(Me)OSiMe3)(η5-C5H5)TiCl2 (5). When using MeSi(OCH(Me)(CH2)4SiMe2H)3 (6), Si(OCH(Me)(CH2)4SiMe2H)4 (8) and MeSi[O(CH2)3SiMe(OCH(Me)(CH2)4SiMe2H)2]3 (10) instead of 1 and 4, the respective metallo dendrimers MeSi[OCH(Me)(CH2)4-SiMe2CH2CH2SiMe2(η5-C5H4)(η5-C5H5)TiCl2]3 (7), Si[OCH(Me)(CH2)4SiMe2CH2CH2SiMe2(η5-C5H4)(η5-C5H5)TiCl2]4 (9) and MeSi{O(CH2)3SiMe[OCH(Me)(CH2)4SiMe2CH2CH2SiMe2(η5- C5H4)(η5-C5H5)TiCl2]2}3 (11) can be isolated. Compounds 3, 5, 7, 9 and 11 were characterised by elemental analysis as well as IR and NMR spectroscopy (1H, 13C{1H}, 29Si{1H}).