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In the imidazo[1,2]diazine series, only the imidazo[1,2‐ a ]‐ and [1,2‐ c ] pyrimidine systems were found to undergo a Dimroth‐type rearrangement under basic aqueous conditions. The electronic and steric factors influencing the rearrangement rates of methyl substituted imidazo‐[1,2‐ a ] pyrimidines are discussed.
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GUERRET et al. (1971) studied this question.
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