Squaric acid → HCID 178448829, compound

Participants

Reaction Steps

Under agitation, 392.9 g (1.85 moles) of 4-n-butylamino-2,2,6,6-tetramethylpiperidine, 10.0 g (0.0877 mole) of quadratic acid, and 150 cc of 2-ethylhexanol were heated to boiling under reflux in a 1-liter agitated flask with water trap; s temperature rose from 205° to 217° C., and 2.8 cc of water was removed from the cycle. The reaction solution was then distilled. The residue was boiled with petroleum ether. After cooling, vacuum-filtering, and drying, 38.9 g was obtained (88.2% yield), mp 151°-152° C. Extinction (g/l.cm) at 278 nm: 25; at 335 nm: 83.

Provenance & Evidence