Thermolysis Reaction of 2-Acetyl-1-Oxo-Five-, Six-, and Seven-Membered Ring

Article abstract of DOI:10.1002/kin.550270902

The rates of gas-phase thermolysis reactions of 2-acetylcyclopentanone 1, 2-acetylcyclohexanone 2, N-acetylcaprolactam 3, 2-acetylbutyrolactone 4, 2-acetyl-2-methylbutyrolactone 5, and 3-acetyl-2-oxazolidinone 6 have been measured over a temperature range of 50 K.They undergo unimolecular first-order elimination reactions for which log A = 11.7, 11.7, 11.2, 11.4, 11.5, and 11.1 s^-1 and E_a = 193.4, 189.5, 153.2, 201.0, 206.8, and 176.1 kJ mol^-1, respectively.The effect of the ring size together with the effect of a heteroatom in the ring on the rate of thermolysis reactions for compounds 1-6 is the subject of this work.