Phosphorus, Sulfur and Silicon and the Related Elements p. 21 - 33 (2008)
Update date:2022-07-30
Topics:
Meciarov, Maria
Toma, Stefan
Loupy, Andre
Horvath, Branislav
Solvent-free reactions of 2- and 3-halopyridines with PPh3, PBu3, and PCy3 were studied under conventional heating, as well as under microwave irradiation. No difference was observed in the reaction course between classical and microwave reactions. 2-Bromopyridine gave quantitative yields of 2-pyridyltriphenylphosphonium bromide within few minutes at 190C. Equimolar amounts of some inorganic salts (LiPF6, LiOTf, LiBr, NaPF6, KPF6) were necessary for the reactions of the other 2-halopyridines. 3-Halopyridines did not react with PPh3 even in the presence of LiPF6. Their reactions with PCy3 in the presence of LiPF6 resulted in the quantitative formation of dicyclohexylphosphine oxide.
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