TY - JOUR
T1 - Synthesis, molecular structure and solution dynamics of dimeric benzamidinates containing a double diazaallyl lithium bridge. A rapid interconversion of σ and π bonds
AU - Eisen, Moris S.
AU - Kapon, Moshe
PY - 1994
Y1 - 1994
N2 - Dimeric Li[N(SiMe3)2] reacted with the nitriles 4-XC6H4CN (X = H or Me) in diethyl ether-hexane (1:10) to yield dimeric complexes [4-XC6H4C(NSiMe3) 2·Li(NCC6H4X-4)]2 (X = H 1 or Me 2). Complex 2 is dimeric in the solid state with two four-co-ordinated lithium cations bound in a N,N′-bidentate π fashion to one amidine anion (chelating), forming a double diazaallyl lithium bridge, in a monodentate σ fashion to a nitrogen lone pair of a substrate molecule, and monodentate to a nitrogen lone pair of a second amidine anion. In solution, rapid interconversion of the different lithium-amidine bonds (σ to π and vice versa)was observed by means of the NMR chemical shifts.
AB - Dimeric Li[N(SiMe3)2] reacted with the nitriles 4-XC6H4CN (X = H or Me) in diethyl ether-hexane (1:10) to yield dimeric complexes [4-XC6H4C(NSiMe3) 2·Li(NCC6H4X-4)]2 (X = H 1 or Me 2). Complex 2 is dimeric in the solid state with two four-co-ordinated lithium cations bound in a N,N′-bidentate π fashion to one amidine anion (chelating), forming a double diazaallyl lithium bridge, in a monodentate σ fashion to a nitrogen lone pair of a substrate molecule, and monodentate to a nitrogen lone pair of a second amidine anion. In solution, rapid interconversion of the different lithium-amidine bonds (σ to π and vice versa)was observed by means of the NMR chemical shifts.
UR - http://www.scopus.com/inward/record.url?scp=37049082496&partnerID=8YFLogxK
U2 - 10.1039/DT9940003507
DO - 10.1039/DT9940003507
M3 - 文章
AN - SCOPUS:37049082496
SN - 1472-7773
SP - 3507
EP - 3510
JO - Journal of the Chemical Society. Dalton Transactions
JF - Journal of the Chemical Society. Dalton Transactions
IS - 23
ER -