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Oleic acid was cis‐trans isomerized by HNO 2 generated in situ by reacting NaNO 2 with a mineral acid. The influence on the reaction of time, temp, agitation, solvent, amt of catalyst and type of mineral acid was investigated. Optimum reaction conditions were defined for achieving equilibrium isomerization in 30 min with minimum by‐product formation. After isomerization, nitrogenous by‐products were efficiently removed using silicic acid. The active species causing cis‐trans isomerization was tentatively identified as free radical nitrogen dioxide.
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Litchfield et al. (1965) studied this question.
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