Magnesium perchlorate is found to be an extremely efficient catalyst for the sulfonylation of activated, unactivated and heterocyclic aromatics under almost neutral conditions.
(a) JensenF.R., and GoldmanG., in: Friedel-Crafts and Related reactions;OlahG., (ed); Wiley Interscience, New York, 1969, Vol (III) pp 1319–1367; (b) R. Taylor, in: Coprehensive Chemical Kinetics; C.H. Bamford and C.F.H. Tipper, (ed); Elsevier: New York, 1972, pp. 77-83
RoyK.M., in: Ullamann's Encyclopedia of Industrial Chemistry;GerhartzW., (ed); VCH: Weinheim (Germany), 1985, Vol. A-25, pp. 487–501.
4.
(a) GraybillB.M., J. Org. Chem., 1967, 32, 2931; (b) H. J., Jr., Sipe, D. W. Clary, S. B. White, Synthesis, 1984, 283; (c) M. Ueda, K. Uchiyoma, T. Kano, Synthesis, 1984, 323.
5.
(a) EffenbergerF., HathmacherK., Chem. Ber., 1976, 109, 2315; (b) M. Ono, Y. Nakamura, S. Sato and J. Itoh, Chem. Lett., 1988, 395.
6.
(a) DaleyS., TrevorK. A., RandlesK. R., and GottB. D., (Zeneca Ltd.) PCT Int. Appl. WO 93 18,000 (GBAppl. 92/4, 529, 3 Mar 1992) (Chem Abstr., 1994, 120, 54320 u); (b) N. A. Bradfora, (ICI plc) Eur. Pat. Appl. Ep 455, 332 (GB Appl. 90/7, 577, 4 Apr. 1990) (Chem. Abstr., 1992, 117, 48101).
7.
SmithK., EwartG. M., and RandlesK. R., J. Chem. Soc., Perkin Trans. 1, 1997, 1085.
