1,3,4-Triphenyl-4,5-dihydro-1H-1,2,4-triazol-5-ylidene 1 reacts with bicyclopropylidene 2 to yield four unexpected products 3–6, none of which resembles the typical [2+1] mode of cycloaddition observed for 1 with electron-deficient alkenes.
A. Meijere, S. I. Kozhushkov, D. S. Yufit and J. A. Howard, Mendeleev Commun., 1999, 9, 5 DOI: 10.1070/MC1999v009n01ABEH001060
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