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7750179 
Journal Article 
Electrophilic aromatic nitration using a mixed catalyst of lithium, molybdenum, ytterbium on silica gel 
Shi, M; Cui, SC 
2003 
1 
Advanced Synthesis & Catalysis
ISSN: 1615-4150
EISSN: 1615-4169 
WILEY-V C H VERLAG GMBH 
WEINHEIM 
345 
12 
1329-1333 
English 
WOS:000188085300008 
A novel mixed catalyst of LiClO4 (15% w/w), Yb(OPf)3 (15% w/w, Pf = perfluorooctanesulfonyl), MoO3 (15% w/w) on silica gel for electrophilic aromatic nitration reaction has been explored. The nitration reactions were accomplished by this mixed catalyst and nitric acid under solvent-free conditions. Moreover, the mixed catalyst can be easily recovered from the aqueous layer by heating in an oven and reused for the next nitration reaction. 
catalyst recycling; halogenated-solvent-free aromatic nitration; lithium; mixed catalyst; molybdenum; perfluorinated rare earth metal salt; silica gel; ytterbium