Stereoselectivity in Diphos Addition to Molybdenum Complex with Pyridine‐2‐thionate (pyS) and η³‐Methallyl Coordinated Ligands

Abstract

The conformational isomers endo-and exo-[Mo{h 3 -C3H4(CH3)}(h 2 -pyS)(CO)(h 2 -diphos)] (diphos: dppm = {bis(diphenylphosphino)methane}, 2; dppe = {1,2-bis(diphenylphosphino)ethane}, 3) are prepared by reacting the double-bridged pyridine-2-thionate (pyS) complex [Mo{h 3 -C3H4(CH3)}(CO)2]2(h 1 :h 2 :mpyS)2, 1 with diphos in refluxing acetonitrile. Stereoselectivity of the methallyl, C 3 H 4 (CH 3 ), ligand improves the formation of the exo-conformation of 2 and 3. Orientations and spectroscopy of these complexes are discussed.