Through a theoretical study, the molecular structures of XPrO are found to be correlated with the Pr oxidation state; compounds with higher oxidation state have more important 4f involvement in the chemical bonding and thus the structure becomes more linear.
Mechanistic insights into the insertion and addition reactions of group 13 analogues of the six-membered N-heterocyclic carbenes: interplay of electrophilicity, basicity, and aromaticity governing the reactivity