Alkyl substituted phenoxyl decay in a hydrogen transfer equilibrium

✍ Scribed by Marta E. J. Coronel

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 72 KB
• Volume: 37
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.20042

✦ Synopsis

Abstract

The kinetics of radical decay in the equilibrium: 2,4,6‐tri‐tert‐butylphenoxyl radical 1 + 2,6‐di‐tert‐butyl‐4‐methylphenol 2 = 2,4,6‐tri‐tert‐butylphenol 3 + 2,6‐di‐tert‐butyl‐4‐methylphenoxyl radical 4 was studied at 298 and 273 K by means of EPR spectroscopy. At 298 K second order prevails, whereas at 273 K the best fit was order 3/2. The extinction of 4 takes place in two steps: dimerization followed by disproportionation of the dimer, but the stable radical 1 enters in crossed dimerization with 4 to yield nonradical products. The mechanism ensures a constant [4]/[1] ratio along the decay. © 2004 Wiley Periodicals, Inc. Int J Chem Kinet 37: 1–4, 2005