Synthesis and asymmetric polymerization of chiral maleimides bearing an aza crown ether

Chiral N-substituted maleimide derivatives bearing L-phenylalanine- or L-leucine-introduced aza crown ether ((S)-A15C5PAMI, (S)-A15C5LMI) were synthesized from maleic anhydride, corresponding amino acids and aza crown ether, and polymerized with an organometal/chiral ligand. The number-average-molec...

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Published inPolymer journal Vol. 43; no. 3; pp. 279 - 284
Main Authors AZECHI, Motohisa, IWAI, Jun, YAMABUKI, Kazuhiro, ONIMURA, Kenjiro, OISHI, Tsutomu
Format Journal Article
LanguageEnglish
Published Avenel, NJ Nature Publishing Group 01.03.2011
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Abstract Chiral N-substituted maleimide derivatives bearing L-phenylalanine- or L-leucine-introduced aza crown ether ((S)-A15C5PAMI, (S)-A15C5LMI) were synthesized from maleic anhydride, corresponding amino acids and aza crown ether, and polymerized with an organometal/chiral ligand. The number-average-molecular weights and the specific optical rotations of the polymers were 700-5600 and -105.8° to -38.3°, respectively. The specific optical rotations of all polymers tended to a positive direction, compared with model compounds ((S)-A15C5PASI ([α]435 =-218.1°), (S)-A15C5LSI ([α]435 =-215.1°)). Asymmetric inductions in the main chains of the polymers were investigated by the measurements of specific optical rotation, circular dichroism.
AbstractList Chiral N-substituted maleimide derivatives bearing L-phenylalanine- or L-leucine-introduced aza crown ether ((S)-A15C5PAMI, (S)-A15C5LMI) were synthesized from maleic anhydride, corresponding amino acids and aza crown ether, and polymerized with an organometal/chiral ligand. The number-average-molecular weights and the specific optical rotations of the polymers were 700-5600 and -105.8° to -38.3°, respectively. The specific optical rotations of all polymers tended to a positive direction, compared with model compounds ((S)-A15C5PASI ([α]435 =-218.1°), (S)-A15C5LSI ([α]435 =-215.1°)). Asymmetric inductions in the main chains of the polymers were investigated by the measurements of specific optical rotation, circular dichroism.
Chiral N-substituted maleimide derivatives bearing L-phenylalanine- or L-leucine-introduced aza crown ether ((S)-A15C5PAMI, (S)-A15C5LMI) were synthesized from maleic anhydride, corresponding amino acids and aza crown ether, and polymerized with an organometal/chiral ligand. The number-average-molecular weights and the specific optical rotations of the polymers were 700-5600 and -105.8 degree to -38.3 degree , respectively. The specific optical rotations of all polymers tended to a positive direction, compared with model compounds ((S)-A15C5PASI ([ alpha ] sub(435)=-218.1 degree ), (S)-A15C5LSI ([ alpha ] sub(435)=-215.1 degree )). Asymmetric inductions in the main chains of the polymers were investigated by the measurements of specific optical rotation, circular dichroism.
Author OISHI, Tsutomu
YAMABUKI, Kazuhiro
IWAI, Jun
ONIMURA, Kenjiro
AZECHI, Motohisa
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Issue 3
Keywords Substituent effect
asymmetric polymerization
Optically active polymer
Nitrogen crown compound
amino acid
Oxazoline derivatives
Chiral compound
Sparteine
Experimental study
Asymmetric induction
Lateral group
Free radical polymerization
Lithium Organic compounds
maleimide
Preparation
Optical activity
Maleimide derivative polymer
Carboxamide
Anionic polymerization
Stereoelective polymerization
Crown compound polymer
aza crown ether
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Snippet Chiral N-substituted maleimide derivatives bearing L-phenylalanine- or L-leucine-introduced aza crown ether ((S)-A15C5PAMI, (S)-A15C5LMI) were synthesized from...
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StartPage 279
SubjectTerms Amino acids
Applied sciences
Asymmetry
Bearing
Crown ethers
Derivatives
Exact sciences and technology
Optical properties
Optical rotation
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Title Synthesis and asymmetric polymerization of chiral maleimides bearing an aza crown ether
URI http://dx.doi.org/10.1038/pj.2010.139
https://www.proquest.com/docview/1030081486/abstract/
https://search.proquest.com/docview/1038238483
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