Persistent Triplet Carbenes.

The article presents a study on the triplet carbenes dialkylcarbenes, arylcarbenes and diarylcarbenes. The study finds that only a spin-delocalizing substituent can be useful to stabilize triplet carbenes. Also, carbene generated from diazo precursor should also have the space to quench by accepting a reagent externally such that a secondary protector should be introduced after the diazo group is introduced. Moreover, the triplet carbenes were found to have numerous applications.