Reactions of Lithium Amidinates or Guanidinates Toward Carbodiimides: Synthesis and Characterization of Multi-Site Triazapentadienyllithium Compounds

Lithium amidinates or guanidinates form novel complexes 1-4 with N,N & PRIME;-dicyclohexylcarbodiimide (CyN=C=NCy, DCC) or N,N & PRIME;-diisopropylcarbodiimide (iPrN=C=NiPr, DIC). Their structures were characterized by spectroscopic and X-ray crystallographic method. The X-ray diffraction analysis revealed that heteroleptic complexes 1-3 were mononuclear with a four-co-ordinate metal center and homoleptic 4 was dimeric. Both the W-shaped 1,3,5-triazapentadienato lithium 1-3 and U-shaped 4 could be regarded as good intermediates en route to their metal complexes with varied substrates.