Squaric acid → HCID 178456803, compound
Reaction equation
[CH2:1]([NH:4][CH:5]1[CH2:10][C:9]([CH3:12])([CH3:11])[NH:8][C:7]([CH3:14])([CH3:13])[CH2:6]1)[CH2:2][CH3:3].[C:15]1(O)[C:19](=[O:20])[C:17](=O)[C:16]=1[OH:21]>C(C(O)CCCCC)C>[CH2:1]([N:4]([C+:15]1[C:16]([O-:21])=[C:17]([N:4]([CH:5]2[CH2:6][C:7]([CH3:14])([CH3:13])[NH:8][C:9]([CH3:11])([CH3:12])[CH2:10]2)[CH2:1][CH2:2][CH3:3])[C+:19]1[O-:20])[CH:5]1[CH2:6][C:7]([CH3:13])([CH3:14])[NH:8][C:9]([CH3:12])([CH3:11])[CH2:10]1)[CH2:2][CH3:3]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
Under agitation, 363.0 g (1.83 moles) of 4-n-propylamino-2,2,6,6-tetramethylpiperidine, 10.8 g (0.095 mole) of quadratic acid, and 150 cc of ethylhexanol were heated in a 1-liter agitated flask with attached water trap for five hours under reflux to boiling; the sump temperature was 205° C., and 3.0 cc of water was removed from the cycle. After concentration of the reaction solution, 33.9 g of crystals was precipitated. Yield: 75.2%, mp 198°-199° C. (from cyclohexane). Extinction (g/l.cm) at 278 nm: 27; at 335 nm: 95.