The dilithiation of N,N′,N″-triphenylguanidine with n-butyllithium in tetrahydrofuran provides the first example of a triazatrimethylenemethane system [C(NPh)3]2–, isoelectronic with both [C(CH2)3]2– and [CO3]2–; the X-ray crystal structure of the dilithium salt shows it to exist as a dimer with planar CN3 structural units.
P. J. Bailey, A. J. Blake, M. Kryszczuk, S. Parsons and D. Reed, J. Chem. Soc., Chem. Commun., 1995, 1647 DOI: 10.1039/C39950001647
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