The reaction of low levels of nitrogen dioxide with methyl linoleate in the presence and absence of oxygen |
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Authors: | Aris A Gallon William A Pryor |
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Affiliation: | (1) Chemistry Department, Louisiana State University, 70803 Baton Rouge, Louisiana;(2) Biodynamics Institute, Louisiana State University, 711 Choppin Hall, 70803-1804 Baton Rouge, LA |
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Abstract: | The reaction of methyl linoleate with low levels of nitrogen dioxide in a carrier gas, such as helium or air, at nitrogen
dioxide concentrations ranging from 2 to 228 ppm was studied and the products formed were monitored. In both aerobic and anaerobic
conditions, low concentrations of nitrogen dioxide reacted with methyl linoleate predominately to form allylic products. When
a 1∶1 mixture of methyl palmitate/methyl linoleate was layered over an aqueous buffer and a nitrogen dioxide stream was passed
from underneath, so that the stream passed through the aqueous layer before contacting the organic layer, allylic products
again predominated. In the absence of air, the allylic products consisted of allylic nitro and nitrite derivatives of linoleate,
whereas in the presence of air, allylic hydroperoxides were the principal products. The findings suggest that fatty acids
with doubly allylic hydrogen atoms react preferentially by a hydrogen atom abstraction reaction rather than by the addition
of nitrogen dioxide to a double bond. |
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