Three-component coupling polymerization of bisallene, aryl dihalides, and nucleophiles via π-allylpalladium complex. II. Effect of nucleophiles on polymerization
✍ Scribed by Nobuyuki Miyaki; Ikuyoshi Tomita; Takeshi Endo
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 209 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
A novel palladium-catalyzed three-component polycondensation of 1,2,10,11dodecatetraene, 4,4 -diiodobiphenyl, and nucleophiles was carried out using various carbanions and amines as a nucleophilic part. The polymerization with various sodium diethyl malonates produced polymers in high yields. Particularly, no exo-double bond was detected in the polymers prepared from sodium diethyl malonates bearing substituents directly on the carbanion center. The ratios of E-and Z-isomeric units in the polymers were dependent on the structure of the nucleophiles used. Other carbanions with appropriate electron-withdrawing groups such as sulphones and ketones can be also used as a nucleophile for the present polycondensation. Within heteronucleophiles examined, cyclic amines were suitable to produce polymers in high yields.