2,2,5,5-tetramethyl-4-phenyl-3-imidazoline-3-oxide-1-oxyl

2,2,5,5-四甲基-4-苯基-3-咪唑啉-3-氧化物-1-氧基

Also known as: TPIO, 4-phenyl-2,2,5,5-tetramethyl-3-imidazolin-1-yloxy-3-oxide free radical, 2,2,5,5-tetramethyl-4-phenyl-3-imidazoline-3-oxide-1-oxyl free radical, [(2,2,5,5-tetramethyl-4-phenyl-3-imidazoline-3-oxide)-1-yloxy]radical, 2,2,5,5-tetramethyl-1-oxyl-4-phenylimidazoline-3-oxide, 2,5-dihydro-4-phenyl-2,2,5,5-tetramethylimidazol-1-oxyl 3-oxide, 4-phenyl-2,2,5,5-tetramethyl-3-imidazoline-3-oxide-1-oxyl radical

2,2,5,5-tetramethyl-4-phenyl-3-imidazoline-3-oxide-1-oxyl (CAS 18796-03-7) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C13H17N2O2 and a molecular weight of 233.28600 g/mol. It is also known as TPIO, 4-phenyl-2,2,5,5-tetramethyl-3-imidazolin-1-yloxy-3-oxide free radical and 2,2,5,5-tetramethyl-4-phenyl-3-imidazoline-3-oxide-1-oxyl free radical. Key properties include a melting point of 103-105ºC(lit.), a boiling point of 378.6ºC at 760mmHg, a density of 1.17g/cm3 and a flash point of 182.8ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

18796-03-7

Jingsj CID

J-27807-4

Molecular Formula

C₁₃H₁₇N₂O₂

Chinese Name

2,2,5,5-四甲基-4-苯基-3-咪唑啉-3-氧化物-1-氧基

Molecular Weight

233.28600 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026