Citation:
YI Wen-Bin, CAI Chun. Friedel-Crafts Acylation in Fluorous Biphasic Systems Catalyzed by Rare Earth(Ⅲ) Perfluorooctanesulfonates[J]. Chinese Journal of Applied Chemistry,
;2005, 22(11): 1187-1191.
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The catalysts of rare earth(Ⅲ) perfluorooctanesulfonates(RE(OSO2C8F17)3,RE=Sc,Y,La~Lu) had been prepared and Friedel-Crafts acylation anisole with Ac2O on RE(OSO2C8F17)3 catalysts in fluorous biphasic systems were investigated.Perfluorohexane(C6F14),perfluoromethylcyclohexane(C7F14),perfluorotoluene(C7F8),perfluoro-octane(C8F18),perfluorooctyl bromide(C8F17Br) and perfluorodecalin(C10F18,cis and trans-mixture) can be used as fluorous solvents for this reaction.Effects of the ratio of fluorous phase/organic phase and different acylation agents on the reaction were studied.The results show that the reaction exhibits a high para-selectivity of the acylation;Y(OSO2C8F17)3 and C10F18 are the best catalyst and fluorous solvent respectively.The yield of Friedel-Crafts acylation of anisole with Ac2O was 56% by using Y(OSO2C8F17)3 as the catalyst and C10F18 as the fluorous solvent,and para-selectivity exceeded 99%.By simple phase-separation,the catalytic activity showed a small drop after the fluorous phase containing only the catalyst was re-utilized for five times.
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