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Lithiated amidines: Syntheses and structural characterisations


Lehmann,  C.
Department of Chemistry, The University of Durham, Science Site, South Road, Durham DH1 3LE, UK;
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Barker, J., Barr, D., Barnett, N., Clegg, W., Cragg-Hine, I., Davidson, M., et al. (1997). Lithiated amidines: Syntheses and structural characterisations. Journal of the Chemical Society, Dalton Transactions, (6), 951-955. doi:10.1039/a605849c.

The reaction of a toluene solution of PhNC(Ph)NHPh (N,N'-diphenylbenzamidine) with n-butyllithium gave the toluene-solvated amidinolithium compound {Li[PhNC(Ph)NPh]}n. Similarly the same reaction performed in the presence of the Lewis-base donors (Me2N)3PO (hmpa), Me2N(CH2)2NMe2 (tmen) or [Me2N(CH2)2]2 (pmdien) yielded the am{Li[PhNC(Ph)NPh·hmpa]}2 2, {Li[PhNC(Ph)NPh]·tmen} 3 and {Li[PhNC(Ph)NPh]. pmdien} 4 respectively. In addition the reaction of a toluene solution of the related amidine PhNC(Me)NHPh (N,N′-diphenylacetamidine) with LiBu in the presence of hmpa afforded {Li[PhNC(Me)NPh]·hmpa}2 5. The solid-state structures of 2-5, which have been resolved by single-crystal X-ray diffraction methods, show both similarities and differences The complexes 3 and 4, which contain the di- and tri-dentate ligands tmen and pmdien respectively, are monomeric, whilst use of the unidentate Lewis base hmpa results in dimers 2 and 5. However, the way in which dimerisation is achieved differs. The co-ordination geometry about the lithium cation is clearly influenced by the choice of donor and as such shows how change in the denticity of the donor ligand utilised can have a significant effect on the solid-state structure of the system.