Stereoselectivity in Diphos Addition to Molybdenum Complex with Pyridine-2-thionate (pyS) and eta~3-Methallyl Coordinated Ligands

摘要

The conformational isomers endo- and exo-[Mo{eta~3-C_3H_4(CH_3)}(eta~2-pyS)(CO)(eta~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{eta~3-C_3H_4(CH_3)}(CO_2)]_2 (eta~1:eta~2:mu-pyS)_2,1 with diphos in refluxing acetonitrile.Stereoselectivity of the methallyl,C_3H_4(CH_3),ligand improves the formation of the exo-conformation of 2 and 3.Orientations and spectroscopy of these complexes are discussed.