Hydrochloric Acid → HCID 66718642, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of concentrated HCl (30 ml, 32%) and water (30 ml) is charged into 100 ml three necked round bottomed flask followed by addition of p-Toluidine (10 g, 0.0.093 mol). The mixture is cooled to 0 to 5° C. and solution of sodium nitrite (11.2 g, 0.16 mol) in water (15 ml) is added into it while maintaining the temperature at 0 to 5° C. This reaction mixture is then slowly added into a solution of 2,2,6,6-tetramethyl-4-hydroxypiperidine (69 g, 0.44 mol) in acetonitrile (2000 ml) and the mixture is stirred at 0 to −5° C. for 1 h. The reaction mass is filtered and the mother liquor evaporated to dryness at 40° C. The solid residue is extracted with cyclohexane (500 ml) and diethyl ether (800 ml). The extracts are decolorized with charcoal (25 g) filtered through bed of celite and concentrated at 25 C to afford 6.0 g of 2,2,6,6-Tetramethyl-1-(p-tolyl-diazenyl)-piperidine-4-ol as a yellow solid, m.p. 85-86° C.

Provenance & Evidence