Caprolactam → HCID 86610174, compound

Participants

Reaction Steps

To a 100 ml flask containing 11.32 g of ε-caprolactam (0.1 mol), 30 ml water was added and stirred for dissolution. Then 21.95 g 40% aqueous solution of tetrafluoroboric acid (0.1 mol) was added dropwise into the flask over 20 min at room temperature. Then the reaction was stirred for another 1 hour. Desired product was formed after water was removed under reduced pressure and then dried at 110° C. under 1–5 mmHg for 1 hour. The yellowish, moisture- and water-stable liquid of N-protonated caprolactam tetrafluoroborate was obtained with a yield of 98.0%, which has a glass transition temperature of −78.2° C., a density of 1.34 g/ml, a viscosity of 503 cP, an electrochemical window of 2.0V, an ionic conductivity of 5.6×10−4 S/cm, and a Hammett acidic scale H0 of 2.56 using 2,4-dinitroaniline as indicator. No melting point was observed.

Provenance & Evidence