Reactions of N-(α-benzotriazolylalkyl)-N,N-dialkylamines with the dialkylamine corresponding to the dialkylamino substituent afford symmetrical aminals in good yields. Treatment with other dialkylamines gives mixtures of the unsymmetrical and the two symmetrical aminals. Cross-over experiments of symmetrical aminals demonstrates interconversions involving iminium ions and that equilibria exist in the systems.
A. R. Katritzky, K. Yannakopoulou and H. Lang, J. Chem. Soc., Perkin Trans. 2, 1994, 1867 DOI: 10.1039/P29940001867
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