Synthetic Nitrogen-containing Polymers and their Application as Copper Supports in Click Chemistry
Keywords:
polyvinylimidazole divinylbenzene; polystyryl pyridine; copper supported; click chemistryAbstract
Two nitrogen-containing polymers were synthesized and used as support for CuSO4 to evaluate their catalytic activity in 1,3-heterodipolar cycloaddition reactions (1,3-DC) of benzylazide and ethyl propiolate. Polyvinylimidazole (PVI-DVB) was obtained by vinylimidazole polymerization with divinylbenzene and polystyryl pyridine (PSP) was prepared by condensation of lutidine and terephtaldehyde and with collidine as the reticulating agent. The activity was measured by titration with staNdard HCl solution, and PVI-DVB showed 4.6 mEg/g and PSP 0.7 mEg/g polymer. Impregnation with copper was possible by stirring the polymers in aqueous CuSO4 solution. PSP fixed less copper (~0.2 %) than PVI-DVB that fixed thirty times more (6.2 %). The 1,3-DC under microwave irradiation, in the presence of PSP-Cu or PVI-DVB-Cu, gave origin to quantitative yields of the triazoles, and 1,4 regioisomer was the main product. By reusing the copper supported (4X), no changes in yields were observed, only a small decrease in regioselectivity.
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