Reactions of lithium amidinates or guanidinates toward carbodiimides: Synthesis and characterization of multi-site triazapentadienyllithium compounds

Abstract

Lithium amidinates or guanidinates form novel complexes 1–4 with N,N′-dicyclohexylcarbodiimide (CyN=C=NCy, DCC) or N,N′-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.