Squaric acid → HCID 178426473, Verbindung

Beteiligte Stoffe

Reaktionsschritte

5.7 g of quadratic acid (0.05 mole) and 50.1 g of 97.7% strength 4-(2-hydroxyethyl)amino-2,2,6,6-tetramethylpiperidine (0.244 mole) were heated for five hours to 200° C. After cooling, the reaction product was boiled with 150 cc of acetone and, after another cooling step, vacuum-filtered and washed with acetone, thus obtaining 16.0 g. Yield: 66.8% of theory, mp 309°-311° C. Extinction (g/l.cm) at 336 nm: 97.

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