N-Phenethyl-4-Piperidinone (NPP) | CAS 39742-60-4 Intermediates of Fentanyl Opioids 1-Phenethyl-4-Piperidone N-Phenethyl-4-piperidinone (NPP) Other Chemical Name:N-(2-PHENETHYL)-4-PIPERIDONE, 1-Phenethyl-4-piperidone, 1-(2-PHENETHYL)-4- PIPERIDONE CAS:    39742-60-4 MF:    C13H17NO MW:    203.28 EINECS:    254-613-5 Melting point :    57-60 °C Storage temp:    Store below +30°C Chemical Properties: YELLOW-BROWN CRYSTALLINE POWDER Purity: 99.4% Use: Pharmaceutical Intermediates, An intermediate of Fentany and Fenspiride. N-Phenethyl-4-piperidinone (NPP) is a derivative of 4-piperidinone with the …