| Some alkali metal and lanthanide guanidinate complexes were first synthesized andwell characterized. The guanidinate isomerization involving 1,3-hydrogen shift was found.1. Reaction of 2,6-iPr2-C6H3NHLi with iPrN=C=NiPr in THF in a 1:1 molar ratio affordedthe guanidinate lithium[iPr(H)NC(NiPr)(NC6H3-2,6-iPr2)Li]2 (1). Complex 1 was wellcharacterized by elemental analysis, IR, NMR spectroscopy, and X-ray diffractionstructural analysis. Crystal structure determination revealed that the 1,3-hydrogen shiftreaction was occurred.2. Reaction of iPrN=C=NiPr with tBuNHLi in a 1:1 molar ratio in THF, then reacted withone equivalent of BuLi, afforded the dilithium guanidinate [iPr(Li)NC(NiPr)(NtBu)Li]2(2). Complex 2 was characterized by elemental analysis, and X-ray diffractionstructural analysis. Crystal structure determination revealed that the 1,3-hydrogen shiftreaction occurred.3. Reaction of [Cy(H)NC(NCy)(NC6H3-2,6-iPr2)Li]2 formed in situ with SmCl3 in a 3:1molar ratio in THF afforded the neutral complexes[Cy(H)NC(NCy)(NC6H3-2,6-iPr2)]3Sm (3). Complex 3 was characterized by elementalanalysis and IR spectrum, and its crystal structure was determined.4. Reaction of 2,6-iPr2-C6H3NHLi with YbCl3 in a 4:1 molar ratio in THF afforded theanion complex [Yb(NH-2,6-iPr2C6H3)4]-[Li(THF)4]+ (4). Complex 4 was characterizedby elemental analysis and IR spectrum, and its crystal structure was determined.5. Reaction of [Yb(NH-2,6-iPr2C6H3)4]-[Li(THF)4]+ with CyN=C=NCy in a 1:3 molarratio in THF afforded the complex [CyN(H)C(NCy)(NC6H3-2,6-iPr2)]3Yb (5).Complex 5 was characterized by elemental analysis and IR spectrum. Crystal structuredetermination revealed that 1,3-hydrogen shift reaction occurred.
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