منابع مشابه
Advances in synthetic optically active condensation polymers – A review
The study of optically active polymers is a very active research field, and these materials have exhibited a number of interesting properties. Much of the attention in chiral polymers results from the potential of these materials for several specialized utilizations that are chiral matrices for asymmetric synthesis, chiral stationary phases for the separation of racemic mixtures, synthetic mole...
متن کاملConfigurational Molecular Glue: One Optically Active Polymer Attracts Two Oppositely Configured Optically Active Polymers
D-configured poly(D-lactic acid) (D-PLA) and poly(D-2-hydroxy-3-methylbutanoic acid) (D-P2H3MB) crystallized separately into their homo-crystallites when crystallized by precipitation or solvent evaporation, whereas incorporation of L-configured poly(L-2-hydroxybutanoic acid) (L-P2HB) in D-configured D-PLA and D-P2H3MB induced co-crystallization or ternary stereocomplex formation between D-conf...
متن کاملAre lignins optically active?
The accepted derivation of lignins from non(enzymatically)-controlled radical coupling reactions has been recently challenged, and it is relevant to ascertain unequivocally whether lignins are or are not (as normally assumed) optically active. Two approaches were used. First, DFRC (derivatization followed by reductive cleavage) dimers derived from beta-5- and beta-beta-units in pine lignins, wh...
متن کاملSynthesis and Characterization of Optically Active Helical Vinyl Polymers via Free Radical Polymerization
A facile synthetic route to prepare the dual-functional molecule, 2,5bis(40-carboxyphenyl)styrene, was developed. The esterification of this compound with chiral alcohols, that is, (S)-(þ)-sec-butanol/(R)-( )-sec-butanol, (S)-(þ)-secoctanol/(R)-( )-sec-octanol, and D-(þ)-menthol/L-( )-menthol, respectively, yielded three enantiomeric pairs of novel vinyl monomers, which underwent radical polyme...
متن کاملHelix-sense selective polymerization of carbodiimides: building permanently optically active polymers from achiral monomers.
The helix-sense selective polymerization of achiral monomers by homochiral catalysts was investigated. Polymerization of chiral carbodiimides (N-(R)-2,6-(dimethylheptyl)-N'-phenylcarbodiimide) by achiral catalysts yields polymers that undergo mutorotation at elevated temperatures, thus illustrating that these chains are formed under kinetic rather than thermodynamic control. Building on this ob...
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ژورنال
عنوان ژورنال: Journal of Synthetic Organic Chemistry, Japan
سال: 1969
ISSN: 0037-9980,1883-6526
DOI: 10.5059/yukigoseikyokaishi.27.1066