Glutaric acid was obtained in a good yield from cyclopentane through oxidation with NO
2. At 65°C, 65% of the NO
2 used was found to be consumed in 3 hrs., and the yield of the dibasic acid reached 91% on a basis of consumed NO
2. As the reaction temperature was raised, the consumption of NO
2 was accelerated, though the yield of glutaric acid dropped. The effects of the ratio NO
2/cyclopentane upon conversion and yield were less evident than that of temperature. The main by-product from this reaction was mononitrocyclopentane. The reaction rate of NO
2 was expressed by the equation :log k=1.08×10
12e 21170/RTwhere, k represented reaction rate constant [mol 1
-1 hr
-1];T represented absolute reaction temperature [°K].
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