Improvement of ligand economy controlled by polymer morphology: the case of polymer-supported bis(oxazoline) catalysts.
A functionalized chiral bis(oxazoline) is used as a chiral monomer in polymerization reactions leading to homo- and copolymers of different morphology. Polymers with a high content of chiral monomer lead to enantioselectivities that are higher than those obtained with the soluble ligand, but the chiral ligand is not used in an optimal way. A hyperbranched polymer, obtained by using a hexavinyldendrimer as the cross-linker, leads to the same enantioselectivities with a more efficient use of the chiral ligand.
Burguete
M I
MI
Dep. Química Inorgánica y Orgánica, E.S.T.C.E., Universidad Jaume I, E-12080 Castellón, Spain.
Díez-Barra
E
E
Fraile
J M
JM
García
J I
JI
García-Verdugo
E
E
González
R
R
Herrerías
C I
CI
Luis
S V
SV
Mayoral
J A
JA
Sanchez-Verdú
P
P
D002384:Catalysis; D003300:Copper / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000138:chemical synthesis; D003521:Cyclopropanes / Q000737:chemistry; D003979:Diazonium Compounds / Q000737:chemistry; D008024:Ligands; D010080:Oxazoles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013237:Stereoisomerism
D003432:Cross-Linking Reagents; D003521:Cyclopropanes; D003979:Diazonium Compounds; D008024:Ligands; D010080:Oxazoles; D011108:Polymers; D011137:Polystyrenes; D003300:Copper; C024075:styrofoam; C030797:cyclopropane; C032111:diazoacetic ester