TY - JOUR
T1 - Lithiated amidines
T2 - Syntheses and structural characterisations
AU - Barker, James
AU - Barr, Donald
AU - Barnett, Nicholas D.R.
AU - Clegg, William
AU - Cragg-Hine, Ian
AU - Davidson, Matthew G.
AU - Davies, Robert P.
AU - Hodgson, Susan M.
AU - Howard, Judith A.K.
AU - Kilner, Melvyn
AU - Lehmann, Christian W.
AU - Lopez-Solera, Isabel
AU - Mulvey, Robert E.
AU - Raithby, Paul R.
AU - Snaith, Ronald
PY - 1997/3/21
Y1 - 1997/3/21
N2 - 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 1. Similarly the same reaction performed in the presence of the Lewis-base donors (Me2N)3PO (hmpa), Me2N(CH2)2NMe2 (tmen) or [Me2N(CH2)2]2NMe (pmdien) yielded the amidinolithium complexes {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 LiBun 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 a change in the denticity of the donor ligand utilised can have a significant effect on the solid-state structure of the system.
AB - 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 1. Similarly the same reaction performed in the presence of the Lewis-base donors (Me2N)3PO (hmpa), Me2N(CH2)2NMe2 (tmen) or [Me2N(CH2)2]2NMe (pmdien) yielded the amidinolithium complexes {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 LiBun 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 a change in the denticity of the donor ligand utilised can have a significant effect on the solid-state structure of the system.
UR - http://www.scopus.com/inward/record.url?scp=33748570495&partnerID=8YFLogxK
U2 - 10.1039/a605849c
DO - 10.1039/a605849c
M3 - Article
AN - SCOPUS:33748570495
SN - 0300-9246
VL - 1997
SP - 951
EP - 955
JO - Journal of the Chemical Society - Dalton Transactions
JF - Journal of the Chemical Society - Dalton Transactions
IS - 6
ER -