Puckering angle in charged B-heterocyclic divalents: A computational DFT study

The introduction of electron-withdrawing groups such as boryl substituents flanking the divalent center (Ë) produces Boron- Heterocyclic divalents (BHEs); a good model of pull–pull carbene story profiting from the ability of boron to stabilize a lone pair in an adjacent position. Every bent singlet structure for all studied species is more stable. The stability of the singlets with a puckered geometry (D1≅66°) is achieved via cross-ring hyperconjugative interactions. Here, we decide to add positive and negative charges to each singlet BHE species and see what happens for their puckering.