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Nitrosation of Meldrum's Acid (2,2-Dimethyl-1,3-dioxane-4,6-dione) and Ethyl Acetoacetate.-At low acidity the Meldrum's acid is nitrosated by (II) and X-NO (X: -Cl, -Br, -SCN) via the carbanion (enolate) to give (III), whereas at higher acidities the enol tautomer of (I) is involved. Nitrosation is catalyzed by Cl-, Br-or SCN-(different dependencies of the two reaction pathways on the acidity of the solution; kinetics, mechanism). -(HERVES BELOSO, P.; ROY, P.; WILLIAMS, D. L. H.; J. Chem. Soc., Perkin Trans. II (1991) 1, 17-21; Dep. Chem., Univ. Sci. Lab., Durham DH1 3LE, UK; EN)