Synthesis and characterization of a chlorofunctionalized unsaturated carbosilane oligomer

✍ Scribed by Sophia K. Cummings; Dennis W. Smith; Kenneth B. Wagener

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 403 KB
• Volume: 16
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.1995.030160502

✦ Synopsis

Acyclic diene metathesis (ADMET) polymerization offers a viable route for the synthesis of chlorofunctionalized unsaturated carbosilane oligomers. The Si-C1 bond in unsaturated carbosilane monomers remains inert during metathesis and the use of a highly reactive molybdenum-based, Lewis acid-free alkylidene catalyst affords unsaturated chlorofunctionalized carbosilane oligomers with known vinyl end groups. The first synthesis of an unsaturated carbosilane oligomer functionalized with a Si-CI bond was performed. A chlorofunctionalized silacyclopentene product was also observed, due to a backbiting reaction. This new class of functionalized oligomers has a low glass transition temperature and sites of unsaturation which may be used for further reaction. ADMET chemistry now provides access to a variety of chlorofunctionalized unsaturated carbosilanes which can be used to tailor make hydrolytically stable carbosilane oligomers and polymers via nucleophilic grafting reactions.