Bis(catecholato)diboron was added to cyclic alkenes with internal strain to selectively form bis(boryl)cycloalkanes quantitatively in the presence of [Pd(NHC)pyCl2], [Pd(NHC)pyI2], and [Pt(NHC)pyI2] (NHC=N-heterocyclic carbene, py=pyridyl), which have been synthesized and characterized for the first time in this study.
![Perceptible influence of Pd and Pt heterocyclic carbene–pyridyl complexes in catalytic diboration of cyclic alkenes](https://www.iciq.org/wp-content/uploads/2014/03/Perceptible-influence-of_261.gif)