Hydrochloric Acid → HCID 87132637, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of concentrated HCl (15 ml, 32%) and water (15 ml) is charged into 100 ml three necked round bottomed flask followed by addition of 4-nitro-aniline (5 g, 0.04 mol). The mixture is cooled to 0 to 5° C. and solution of sodium nitrite (4.14 g, 0.06 mol) in water (5 ml) is added into it while maintaining temperature 0 to 5° C. This reaction mixture is then slowly added into a solution of sodium tetrafluoroborate (6.6 g, 0.06 mol) in water (60 ml) at 0 to 5° C. The resulting solution of diazonium tetrafluoroborate salt is then added to solution of 2,2,6,6-tetramethyl-4-hydroxypiperdine (25.1 g, 0.16 mol) in acetonitrile (1000 ml)) and the mixture is stirred at 0 to −5° C. for 1 h. This reaction mixture filtered and mother liquor is evaporated to dryness at 40° C. The residue is extracted with diethyl ether (200 ml) the extract is decolorized with charcoal (50 g), filtered through bed of celite and concentrated to dryness to afford 0.56 g of 2,2,6,6-Tetramethyl-1-(4-nitrophenyldiazenyl)-piperidin-4-ol as a yellow solid, m.p. 108-110° C.

Provenance & Evidence