A good correlation was found between the amount of NO22− formed by adsorption of NO on CaO and the rate of cis–trans interconversion of 2-butene. The cis–trans isomerization which occurred very rapidly over CaO evacuated at 700–900°C was inhibited by adsorption of NO, whereas the double bond isomerization was not. Active sites for the cis–trans interconversion was ascribed to unusually strong basic sites.
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Iizuka et al. (1976) studied this question.
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