Neutral cyclic sp-sp and sp-sp diboranes from ,'-dicyclohexylcarbodiimide insertion into 1,2-dichlorodiboranes(4).

We report the synthesis and structural characterization of new neutral cyclic sp2-sp3 and sp3-sp3 diboranes from the reaction of N,N'-dicyclohexylcarbodiimide with 1,2-dichlorodiboranes(4) at room temperature. The present study is the first example of an insertion reaction of carbodiimide into diborane(4).