Stable Strained Donor-Free Silanone and Its Derived NHC-Stabilized Disilacyclobutadiene and Cyclic Alkenyl Silylene.

The strained silanone was obtained by the reaction of disilacyclobutene with NO. Silanone exhibited unprecedented thermal stability in both the solid state and solution. DFT calculations on revealed that the highly polarized Si═O double bond is effectively stabilized by its electron delocalization with the unsaturated SiC ring.