2-Halopyridines in the triple reaction in the Pn/KOH/DMSO system to form tri(2-pyridyl)phosphine: Experimental and quantum-chemical dissimilarities

Experimental and quantum-chemical features of the triple nucleophilic substitution of halogen atoms in 2-chloro- and 2-bromopyridines under the action of P-centered nucleophiles generated in the system P_n/KOH/DMSO to afford tri(2-pyridyl)phosphine in a yield of up to 69% have been compared.