Chiral Bridged Aminotroponiminate Complexes of the Heavy Lanthanides

The enantiomerically pure monobridged aminotroponiminate, H2{(iPrATI)2Cy}, in which
two amino-isopropoyl-troponimine moieties are linked by (R,R)-1,2-diammoniumcyclohexane
has been prepared. The corresponding dipotassium salt K2{(iPrATI)2Cy} can be obtained
from a reaction of H2{(iPrATI)2Cy} with potassium hydride. Further reactions of K2{(iPrATI)2Cy} with anhydrous ytterbium and lutetium trichloride, respectively, in THF leads to the
chiral complexes [{(iPrATI)2Cy}LnCl(THF)] (Ln = Yb (1a), Lu (1b)). The structures of 1a,b
were confirmed by single-crystal X-ray diffraction in the solid state. Treatment of the lutetium
complex 1b with an excess of KN(SiMe3)2 afforded the chiral heteroleptic amido complex
[{(iPrATI)2Cy}LuN{(SiMe3)}2] (2).