1.
Angew Chem Int Ed Engl
; 61(25): e202203169, 2022 Jun 20.
Artículo
en Inglés
| MEDLINE
| ID: mdl-35394706
RESUMEN
We developed o-carborane as a new mechanophore by showing that the o-carborane cluster is the preferred scission site in chain-centered polymers through ultrasonication mechanochemistry. Mechanistic studies are consistent with a predominately homolytic mechanism of chain scission. The mechanically generated monocarbaborane fragments are highly reactive toward alcohol nucleophiles. By contrast, carborane with a different regiochemistry (m-carborane) maintained its high mechanical stability. DFT simulations provide insights into the origins of carborane's mechanical lability. This fundamental research provides a new stimulus for carborane cage activation.