Accession Number : ADA310764

Title :   The Controlled Functionalization of Polystyrene. Introduction of Reactive Groups by Multisite Metalation with Superbase and Reaction with Electrophiles.

Descriptive Note : Technical rept.,

Corporate Author : CORNELL UNIV ITHACA NY BAKER LAB

Personal Author(s) : Lochmann, Lubomir ; Frechet, Jean M.

PDF Url : ADA310764

Report Date : 30 JUN 1996

Pagination or Media Count : 16

Abstract : The controlled functionalization of polystyrene using a process of metallation with a potassium superbase followed by reaction with electrophiles is described. The method is advantageous because metallation is extremely efficient occurring rapidly even at room temperature, and the degree of functionalization can be controlled over a very broad range. Functionalization with trimethylsilyl groups allows effective monitoring and quantification of the metallation process. Other examples of modification include the introduction of small dendritic fragments by reaction with a dendron having an aldehydic focal point, or the introduction of carboxylic acid pendant groups. This method which has little effect on the polydispersity of the polymer has broad applicability for the functionalization of a wide spectrum of polymers containing active hydrogens and may also be used to prepare randomly branched or star structures.

Descriptors :   *CONTROL, *POLYSTYRENE, *REACTIVITIES, *BASES(CHEMISTRY), *METALATION, METHYL RADICALS, MOLECULES, POLYMERS, STRUCTURES, ROOM TEMPERATURE, HYDROGEN, ELECTRONS, CHEMICAL REACTIONS, POTASSIUM, FRAGMENTS, DENDRITIC STRUCTURE, ALDEHYDES, CARBOXYLIC ACIDS.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE