Reaktion an ziegler-natta-katalysatoren, 16. Metathese-abbau von polybutadien-derivaten mit sauerstoff bzw. schwefel enthaltenden Substituenten

✍ Scribed by Hummel, Klaus ;Wedam, Othmar A. ;Kathan, Wolfgang ;Demel, Hans

• Publisher: Wiley (John Wiley & Sons)
• Year: 1978
• Weight: 333 KB
• Volume: 179
• Category: Article
• ISSN: 0025-116X
• DOI: 10.1002/macp.1978.021790504

✦ Synopsis

Abstract

Methylene groups of 1,4‐polybutadiene were partially brominated with N‐bromosuccinimide. A subsequent Grignard‐Wurtz‐reaction with 4‐methoxyphenyl‐, 3,4‐dimethoxyphenyl‐, and 2‐thienylmagnesium bromide resulted in an exchange of the bromine atoms for 4‐methoxyphenyl, 3,4‐dimethoxyphenyl and 2‐thienyl groups. Another type of modification was the reaction of 1,4‐polybutadiene with 4‐methoxytoluene and o‐resp: p‐toluic acid methylester in the presence of dicumyl peroxide. Thereby 4‐methoxyphenylmethyl and 2‐ resp. 4‐methoxycarbonylphenylmethyl groups were introduced into the polymer. The modified polymers were investigated by IR‐spectroscopy and degraded by olefin metathesis with 4‐octene using a WCl~6~/Sn(CH~3~)~4~ catalyst. The degradation products were separated by gas chromatography and identified by mass spectrometry.