575451-45-5Relevant academic research and scientific papers
Synthesis of periphery-functionalized dendritic polyethers
Díez-Barra, Enrique,González, Raquel,Sánchez-Verdú, Prado,Tolosa, Juan
, p. 1563 - 1569 (2007/10/03)
New dendritic polyethers with bromo-, hydroxy- and vinyl-end groups have been synthesized by a convergent strategy. Planar, 1,3,5- trischlorocarbonylbenzene and 1,3,5-trihydroxybenzene, and tetrahedral, tetrakis(p-hydroxyphenyl)methane, cores have been used.
Polymer immobilization of bis(oxazoline) ligands using dendrimers as cross-linkers
Diez-Barra, Enrique,Fraile, Jose M.,Garcia, Jose I.,Garcia-Verdugo, Eduardo,Herrerias, Clara I.,Luis, Santiago V.,Mayoral, Jose A.,Sanchez-Verdu, Prado,Tolosa, Juan
, p. 773 - 778 (2007/10/03)
Homopolymers of bis(oxazoline) ligands can be used to prepare efficient catalysts for cyclopropanation reactions. However, the low accessibility to most bis(oxazoline) moieties leads to a low copper loading. As a consequence, the transmission of chiral information from the complexed polymer is not very efficient and only a few chiral cyclopropane molecules are obtained from each molecule of chiral ligand. The use of suitable dendrimers as cross-linkers in the polymerization process allows better copper functionalization. As a consequence the productivity of chiral cyclopropanes per molecule of chiral ligand greatly increases, which improves the ligand economy and the chirality transfer.
