Dioxane derivativesDioxane derivatives R 0470 1,1,3,3,3-Pentafluoro-2-pentafluorophenyl-1,2-epoxypropane and Trimethylphosphite: Unusual 1,4-Dioxan-2,5-dione Ring Formation. -Reaction of the title epoxide (I) with P(O-Me) 3 provides a mixture of diastereomeric dioxanediones (II)/(III) via cyclodimerization of an intermediately generated α-lactone. Hydrolysis of these dioxanes provides the hydroxypropionic acid (IV). -(KADYROV, A. A.; SILAEV, D.; BREUER, E.; ROESCHENTHALER*, G.-V.; J. Fluorine Chem. 114 (2002) 1, 99-101; Inst. Anorg. Phys. Chem., Univ. Bremen, D-28334 Bremen, Germany; Eng.) -D. Singer
Pyrazole derivatives
Pyrazole derivatives R 0180Naphthoindazoles. Synthesis of 4,11-Dimethoxy-naphtho[2,3-f]indazole-5,10-dione. -A facile synthesis of the previously unknown title compound (V) via thermal cyclization of the N-nitroso derivative derived from 2-acetamidoanthraquinone (IV) is developed. -(SHCHEKOTIKHIN, A. E.; SILAEV, D. A.; BABERKINA, E. P.; MAKAROV, I. G.; BUYANOV, V. N.; SUVOROV, N. N.; Chem. Heterocycl. Compd. (N. Y.) 38 (2002) 5, 543-546; Mendeleev Russ. Univ. Chem. Technol., Moscow 125190, Russia; Eng.) -M. Schroeter 03-101
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