Ytterbium(III) trifluoromethanesulfonate [Yb(OTf)3] has been used to catalyse Friedel–Crafts acylation of substituted thiophenes in different solvents to produce several intermediates of pharmaceuticals and pesticides with good yields. The amount of catalysis was discussed and Yb(OTf)3 could be reused without loss of activity.
KobayashiS., and IwamotoS., Tetrahedron Lett., 1998, 39, 4697.
17.
MatsuoJ., OdashimaK., and KobayashiS., Synlett., 2000, 403.
18.
KobayashiS., and KomotoI., and MatsuoJ., Adv. Synth. Cata., 2001, 71, 343.
19.
KomotoI., MatsuoJ., and KobayashiS., Topics in Catalysis, 2002, 19, 43.
20.
FosbergJ.H., SpazianoV. T., BalasubramanianT. M., LiuG. K., KinsleyS. A., DuckWorthC. A., PoterucaJ. J., BrownP. S., and MillerJ. L., J. Org. Chem., 1987, 52, 1017.
21.
Sadtler research laboratories, INC.Sadtler Standard N. M. R. Spectra, 1980, 1-3, 123M.
22.
Sadtler research laboratories, INC.Sadtler Standard N. M. R. Spectra, 1980, 31-34, 21211M.
23.
FarrarM.W., and LevineR., J. Am. Chem. Soc., 1950, 72, 3695.