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Hydrogenation of five‐membered heterocycles of polymer‐supported palladium catalyst at normal temperature and pressure
Author(s) -
Guo Zhen,
Feng Hua,
Ma Hengchang,
Kang QiaoXiang,
Yang ZhiWang
Publication year - 2004
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.448
Subject(s) - polystyrene , thiophene , catalysis , x ray photoelectron spectroscopy , furan , palladium , polymer chemistry , materials science , polymer , double bond , chemistry , chemical engineering , organic chemistry , engineering
To modify the surface of aminomethyl polystyrene, grafting of hyperbranched dendritic polyamidoamine, a new class of topological macromolecules, onto the surface was investigated. It was found that hyperbranched dendritic polyamidoamine was propagated from aminomethyl polystyrene surface by repeating two processes: (1) Michael addition; (2) amidation. Furthermore, salicylal (SA) readily postgrafted to the hyperbranched dendritic polyamidoamine‐grafted‐aminomethyl polystyrene. Finally, catalytic hydrogenations of pyrrole, furan and thiophene were investigated by the modifying polyamidoamine‐grafted aminomethyl polystyrene with SA (MPGAPS)‐supported palladium catalyst. The double‐bond of the ring was hydrogenated to single‐bond ring of tetrahydro‐compound at first, then the ring is broken directly. In general, these reactions were degradation under reduction. UV absorbance spectroscopy, gas chromatography (GC), and power of hydrogen (PH) detection were used to analyze the reactants and products, and infrared (IR), X‐ray photoelectron spectroscopy (XPS) and inductively coupled plasma‐atomic emission spectrometry (ICP‐AES) characterized the catalyst. Copyright © 2004 John Wiley & Sons, Ltd.