期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 16, 期 14, 页码 1901-1905出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202100444
关键词
porous; PCSs; Friedel-Crafts reaction; cage-like organosiloxanes; phosphazenes; catalysis; Knoevenagel reaction
资金
- National Natural Science Foundation of China (NSFC) [21975144]
- Key Research and Development Program of Shandong province [2019GHZ034]
- Ministry of Science and Technology of the People's Republic of China [G20190015042, G20190015037]
- Seed Fund Program for the International Research Cooperation of Shandong University
Phosphazene-containing porous materials and cage-like silsesquioxanes are promising for catalytic applications, with the former serving as adsorbents and basic catalysts while demonstrating high efficiency in the Knoevenagel reaction. This study highlights the potential of porous polymers based on organosiloxane compounds as basic catalysts for various reactions, opening up new perspectives in the field.
Phosphazene-containing porous materials are of a great interest due to their unique properties, caused by the synergetic presence of nitrogen and phosphorus atoms, and have found applications as adsorbents, basic catalysts, etc. On the other hand, cage-like silsesquioxanes are ideal building blocks for the preparation of covalently-linked porous materials. Here two new phosphazene-functionalized organosilsesquioxane cage-based porous polymers were synthesized successively by a Friedel-Crafts reaction of hexapyrrolylcyclotriphosphazene with octavinylsilsesquioxane in the presence of AlCl3 and CF3SO3H as catalysts. The nature of acid catalysts barely influenced the character of pores due to the interaction of catalysts with basic nitrogen atoms of phosphazene units. The obtained polymers exhibited high efficiency as metal-free catalysts for the Knoevenagel reaction. This work opens new perspectives in the use of porous polymers based on cage-like organosiloxane compounds as basic catalysts for various reactions.
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