Dihydropyrazine (DHP), the intermediate for pyrazine, is synthesized from ethylenediamine and propylene glycol; it is assumed that the reaction proceeds by photooxidation of propylene glycol and cyclization with ethylenediamine to give dihydromethylpyrazine, which by subsequent oxidative demethylation via the corresponding acid, forms dihydropyrazine; molecular oxygen, light and TiO2/zeolite promote the reaction.
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Rao et al. (2000) studied this question.
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