作者:Garret M. Miyake、Daniel A. DiRocco、Qin Liu、Kevin M. Oberg、Ercan Bayram、Richard G. Finke、Tomislav Rovis、Eugene Y.-X. Chen
DOI:10.1021/ma101310n
日期:2010.9.28
stereocenters that renders one-handed helicity of (R)-PVOZ and (R)-PHVOZ. Significantly, this novel cationic polymerization process, operating at ambient temperature, effectively assembles two elements of polymer local chirality—side-chain chirality and main-chain chirality—into global chirality in the form of excess one-handed helicity. Furthermore, the resulting chiral helical vinyl polymers exhibit considerably
通过手性恶唑烷酮辅助剂官能化的丙烯酰基和乙烯基单体已通过先前建立的同种异型配位聚合(对于丙烯酰基单体)或新型的同种异型阳离子聚合(对于乙烯基单体)成功以立体有规方式聚合为高度等规的旋光聚合物。 。具体地,共轭手性acryloyloxazolidinones,ñ -丙烯酰基(- [R或小号)-4-苯基-2-恶唑烷酮[([R或小号)-AOZ],容易由聚合的手性柄型-zirconocenium配位催化剂,(R,R - , - S,S-或R,R / S,S) - [C 2 H ^ 4(η 5 -Ind)2 ]的Zr +(THF)[OC(O我PR)═CMe 2 ] [MEB(C 6 ˚F 5)3 ] - (1),在全同有择的方式通过催化部位控制的机制,产生相应的旋光性手性聚合物,(R或S)-PAOZ。由于手性催化剂位点决定了立体控制的性质,即使没有手性侧基的母体AOZ的配位聚合也使PAOZ具有几乎定