1. For a general overview, see: (a) Katritzky, A. R.Comprehensive OrganicFunctional Group Transformations; Katritzky, A. R., Ed.; Pergamon: Oxford, 1995; Vol. 5, pp 154−161. (b) Franklin, A. S.J. Chem. Soc.,Perkin Trans. 11998, 2451−2465. Some recent approaches include Heck reaction: (c) Beletskaya, I. P.; Cheprakov, A. V.Chem. Rev.2000,100, 3009−3066 and cross metathesis: (d) Chatterjee, A. K.; Toste, F. D.; Choi, T.L.; Grubbs, R. H.Adv. Synth.Catal.2002,344, 634−637.
2. Zr(IV)Fe(III), Ga(III), and Sn(IV) Binary Metal Complexes as Synergistic and Reusable Esterification Catalysts
3. Direct Condensation of Carboxylic Acids with Alcohols Catalyzed by Hafnium(IV) Salts