α-Oxetanyl-N-aziridinyl imines undergo ring expansion on heating to afford dihydrofurans via alkylidenecarbenes, whereas heating α-tetrahydrofuranyl and α-tetrahydropyranyl N-aziridinyl imines affords the ring expanded cyclic enol ethers via alkyl carbenes.
S. Kim, J. Yoon and C. M. Cho, Chem. Commun., 1996, 909 DOI: 10.1039/CC9960000909
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