2,2-dimethyl-5-acetyl- 1,3-dioxane-4,6-dione/Acetyl-Meldrum’s acid

 The product has an R_f of 0.22 in 5% methanol/methylene chloride (silica gel) and displays the following spectral data: ¹H NMR (300 MHz, CDCl₃) δ: 1.71 (s, 6 H), 2.64 (s, 3 H) ; ¹³C (75 MHz, CDCl₃) δ: 37.5, 42.4, 45.1, 106.2, 118.6, 174.8, 184.2, 207.5 .  The acidic proton was not observed in the ¹H NMR spectrum.

lightyellow plate, mp 87.6-88.0°C

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