Caprolactam → HCID 86749896, compound

Participants

Reaction Conditions

Reaction Steps

To a 1000 mL three-necked round-bottomed flask equipped with a reflux condenser, internal thermometer, argon inlet, and mechanical stirrer, are added ε-caprolactam (48.04 g, 0.42 mol), toluene (340 mL), and triethylamine (189.00 g, 1.87 mol). The mixture is heated to reflux (ca. 101° C.) for 15 min. While at that temperature, acid chloride 3 (100.00 g, 0.47 mol) is added as a solid over 30 min. The reaction is maintained at reflux for an additional 1.75 h before the heat is removed. At room temperature, the mixture is filtered and the salts washed with toluene. The dark filtrate is washed with saturated sodium bicarbonate solution (3×250 mL), water (100 mL), and dried over MgSO4. The mixture is filtered and concentrated by rotary evaporation at about 50° C. (water aspirator) and then by Kugelrohr distillation at 60° C. for 1 h to give 89.64 g (83%) of 4 as a dark red oil.

Provenance & Evidence