ChemInform Abstract: N,N′‐Dilithiobis(alkylamino)phenylboranes as Starting Materials for Four‐Membered Metallacycles.

With sterically demanding substituents at the N‐atoms the reaction of the title boranes such as (I) with metal tetrachlorides or diorganometaldihalides yields the borametallacyclobutanes (III), (V) and (VII).