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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/917

Title: Synthesis and reactivity of novel oligosilanes bearing functional carbosilane side chains
Authors: Shankar, Ravi
Saxena, Anubhav
Brar, Ajaib S
Keywords: Carbosilanes
Hydrosilylation
Dehydropolymerization
Chemoselectivity
Issue Date: 2001
Citation: Journal of Organometallic Chemistry, 628(2), 262–270
Abstract: New carbosilane monomers R1R2R3SiXSiH3 (X=CH2CH2-and -CH(CH3); R1=H, R2=Me, R3=Ph (1a); R1=H, R2, R3=Ph (2a); R1, R2, R3=Et (3a) bearing primary and/or tertiary Si-H groups undergo Cp2TiCl2/n-BuLi catalyzed dehydropolymerization selectively at the primary Si-H site to afford the corresponding oligosilanes 1–3, [R1R2R3SiXSiH]n (n=12–15). Treatment of the oligosilanes 1 and 2 with methanol in the presence of a catalytic amount of biguanide base results in the chemoselective transformation of the pendant carbosilyl Si-H to Si-OMe groups, yielding the methoxy- substituted oligosilanes 4 and 5 (R1=OMe), respectively. The reaction of 3 with methanol under a similar base catalyzed conditions reveals only 5% conversion of the skeletal Si-H to Si-OMe groups. The oligosilanes 1–5 are characterized by IR, UV, 1H, 13C, 29Si, (1H–29Si) HSQC-NMR spectroscopy, GPC and TGA.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/917
Appears in Collections:Chemistry

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