Pyrazole derivatives R 0180Reactions of Hydroxyazolidines with π-Donor Heterocycles. Part 3. Reaction of 1-Acetyl-5-hydroxypyrazolidines with Oxindoles. -Pyrazolidinyloxindoles (III) are prepared by the reaction of 5-hydroxypyrazolines (II) with 5-pyrazolones (I) on the surface of potassium fluoride-modified alumina as heterogeneous catalyst. -(DLINNYKH, I. V.; GOLUBEVA, G. A.; LESHCHEVA, I. F.; NESTEROV, V. V.; ANTIPIN, M. Y.; SVIRIDOVA, L. A.; Chem. Heterocycl. Compd. (N. Y.) 40 (2004) 9, 1142-1149; Lomonosov Moscow State Univ., Moscow 119899, Russia; Eng.) -R. Langenstrassen 23-116