Synthesis of linear and branched polyketones from the Rh complex catalyzed living alternating copolymerization of (4-alkylphenyl)allene with CO
✍ Scribed by Kohtaro Osakada; Yasumasa Takenaka; Jun-Chul Choi; Isao Yamaguchi; Takakazu Yamamoto
- Book ID
- 101277561
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 144 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
Copolymerization of (4-hexylphenyl)allene and of (4-dodecylphenyl)allene with carbon monoxide (1 atm) catalyzed by Rh
Molecular weights of the polyketone prepared from (4-hexylphenyl)allene and CO are similar to the calculated from the monomer to initiator ratios until the molecular weight reaches to 45,000, indicating the living polymerization. Melting points of the polyketones I-[-CO-C(ACHC 6 H 4 R-p)-CH 2 -] n (n ϭ ca. 100) increase in the order R ϭ C 12 H 25 Ͻ C 6 H 13 Ͻ C 4 H 9 Ͻ CH 3 Ͻ H. Block and random copolymerization of phenylallene and (4-alkylphenyl)allene with carbon monoxide gives the new copolyketones. The polymerization of a mixture of (4-methylphenyl)allene and smaller amounts of bis(allenyl)benzene under CO afforded the polyketone with a crosslinked structure.