期刊
MACROMOLECULES
卷 43, 期 17, 页码 6962-6967出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma100866n
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [18350062, 22550110]
- Grants-in-Aid for Scientific Research [18350062, 22550110] Funding Source: KAKEN
Asymmetric anionic polymerization of a prochiral quinone methide monomer, 7-cyano-7-ethoxycarbonyl-1,4- benzoquinone methide (1), was examined using two chiral anionic initiators, lithium 4-isopropylphenoxide ((PrPhOLi)-Pr-i)/(-)-sparteine((-)-Sp) and (PrPhOLi)-Pr-i/(S)-(-)-2,2'-isopropylidenebis(4-pheny1-2oxazoline) ((-)-PhBox) initiators, in a mixture solution of dichloromethane/toluene (30/70 in vol %), and optical activities of the resulting polymers and oligomers (1-mer and 2-mer) were investigated in detail. On asymmetric anionic polymerization of 1 with (PrPhOLi)-Pr-i/(-)-Sp initiator, stereoselectivity was quite low on both initiation and propagation reactions, while in the case of (PrPhOLi)-Pr-i(-)-Ph Box initiator, stereoselectivity was quite low on the initiation reaction, but the propagation reaction proceeded stereoselectively, resulting in an optically active polymer of 1 (poly(1)) with a large positive specific rotation.
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