Squaric acid → HCID 178426473, Verbindung
Reaktionsgleichung
[C:1]1(O)[C:5](=[O:6])[C:3](=O)[C:2]=1[OH:7].[OH:9][CH2:10][CH2:11][NH:12][CH:13]1[CH2:18][C:17]([CH3:20])([CH3:19])[NH:16][C:15]([CH3:22])([CH3:21])[CH2:14]1>CC(C)=O>[OH:9][CH2:10][CH2:11][N:12]([C+:1]1[C:2]([O-:7])=[C:3]([N:12]([CH:13]2[CH2:14][C:15]([CH3:22])([CH3:21])[NH:16][C:17]([CH3:20])([CH3:19])[CH2:18]2)[CH2:11][CH2:10][OH:9])[C+:5]1[O-:6])[CH:13]1[CH2:14][C:15]([CH3:22])([CH3:21])[NH:16][C:17]([CH3:20])([CH3:19])[CH2:18]1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
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.