Polymers with controlled molecular architecture: control of surface functionality in the synthesis of dendritic hyperbranched macromolecules using the convergent approach

摘要: The synthesis of unsymmetrically or non-uniformly surface-functionalized dendritic macromolecules using a stepwise convergent-growth approach is described. By alkylation the monomer unit, 3,5-dihydroxybenzyl alcohol, with unsubstituted and substituted benzylic bromides, followed by activation group located at focal point, ‘wedges’ can be obtained in which there only single substituent such as cyano periphery. Use bromides first step growth allows fully functionalized wedges to obtained. Coupling polyfunctional core 1,1,1-tris-(4′-hydroxyphenyl)ethane also done manner both mono give containing one, two, three groups sixteen thirty-two bromine atoms periphery macromolecule. These hyperbranched polymers were purified normal flash chromatography characterized combination spectroscopic chromatographic techniques. variations this general scheme number placement functional macromolecule accurately controlled afford large variety moieties.