Thermal Cleavage and Isomerization of 1,3‐Diboretanes to Stable Methyleneboranes

This is the authors' abstract. We don't add key points for this paper.

The stable methyleneboranes 1 and 4, with strongly polarized B–C double bonds, readily form upon melting of the 1,3-diboretanes 2 and 3, respectively. The polarity and stability of 1 and 4 can be easily rationalized by the presence of the silyl substituents, which stabilize negative charges in the α position and electron deficiencies in the β position. Furthermore, they effect kinetic stabilization (Aryl = mesityl or duryl).