An efficient method for aromatic Friedel–Crafts alkylation, acylation, benzoylation, and sulfonylation reactions
作者:Ravi P Singh、Rajesh M Kamble、Kusum L Chandra、P Saravanan、Vinod K Singh
DOI:10.1016/s0040-4020(00)01005-x
日期:2001.1
Aromatic electrophilic substitution reactions such as alkylation, acylation, benzoylation, and sulfonylation were studied in the presence of a catalytic amount of Cu(OTf)2 and Sn(OTf)2. Cu(OTf)2 was very efficient for alkylation, acylation, and benzoylation reactions. However, in case of sulfonylation reactions, Sn(OTf)2 gave better results.
The synthesis of diarylsulfones with simple arenes and K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>through double C–S bond formation
作者:Yiqing Yang、Zhang Chen、Yu Rao
DOI:10.1039/c4cc05964f
日期:——
An unprecedented double C-S bond formation method has been developed to prepare both symmetric and unsymmetric diarylsulfones with simple arenes in a single step. This represents the first example that K2S2O8 can be employed as a highly effective sulfonating agent to synthesize diarylsulfones. The reaction demonstrates excellent reactivity, good functional group tolerance and high yields.
reactive and/or nonvolatile reagents (anisole, xylenes, mesitylene) expeditious conditions (short reaction time at constant MW power without control of the temperature) were used. With less reactive and/or low-boiling reagents (benzene, toluene, halobenzenes), the rise in temperature and the increase of reaction time were controlled either by sequential MW irradiation or by a temperature order. It was shown
Sulfonylation of aromatic compounds with sulfonic acids using silica gel-supported AlCl<sub>3</sub>as a heterogeneous Lewis acid catalyst
作者:Kaveh Parvanak Boroujeni
DOI:10.1080/17415991003777391
日期:2010.6
Silica gel-supported aluminum chloride (SiO2–AlCl3) has been shown to be a mild, efficient, and chemoselective heterogeneous Lewis acid catalyst for direct conversion of arenes to sulfones usingsulfonicacids as sulfonylating agents. The catalyst can be prepared easily with cheap starting materials and is stable (as a bench-top catalyst) and reusable.
Polystyrene Supported Al(OTf)<sub>3</sub>: a Stable, Efficient, Selective, and Reusable Catalyst for Sulfonylation of Arenes with Sulfonic Acids
作者:Kaveh Parvanak Boroujeni
DOI:10.5012/bkcs.2010.31.7.1887
日期:2010.7.20
supported aluminium triflate (Ps-Al(OTf)3) was found to be an efficient and chemoselective heterogeneous Lewis acid catalyst for the direct conversion of arenes to sulfones using sulfonic acids as sulfonylating agents. The solid acid catalyst is stable (as a bench top catalyst) and can be easily recovered and reused without appreciable change in its efficiency.