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Synthesis of Tetraaminoalkenes containing the Reduced Pyrimidine Skeleton and the X-ray Molecular Structure of 1,1?-Ethylene-3,3?-dibenzylbi(hexahydropyrimidin-2-ylidene)
(1996) Alici B.; Çetinkaya E.; Çetinkaya B.; Ülkü D.; Tahir M.N.
Deprotonation of a 1,1?-bridged bis(1,3-dialkyl-1,4,5,6-tetrahydropyrimidinium) diiodide with NaH gives in high yield a tetraaminoalkene 4, whereas the corresponding non-bridged tetrahydropyrimidinium iodide reacts with NaH only in the presence of KOBut; the title bridged tetraaminoalkene 4f was structurally characterized by single-crystal X-ray diffraction.