Preparation and Characterization of the Dichloro bis-(2-Pentyne) Complex [WCl2(CO)(NCMe)(η2-EtC2Me)2]

Abstract

Preparation of [WCl₂(CO)₃(NCMe)₂] by reacting of [WI₂(CO)₃(NCMe)₂] with two equivalents of NaCl in acetone, followed with an excess of EtC₂Me (2-pentyne) in CH₂Cl₂ gives the 2-pentynecomplex [WCl₂(CO)(NCMe)(η²-EtC₂Me)₂] (1). Equimolar quantities of 1 with (L = NPh₃ and PPh₃) react in CH₂Cl₂ to give the acetonitrile replaced products, [WCl₂(CO)(PPh₃)(η²-EtC₂Me)₂] (2) and [WCl₂(CO)(NPh₃)(η²-EtC₂Me)₂] (3) in good yield. Reaction of 1 with equimolar amount of bidentate of {L₂ = Ph₂P(CH₂)_nPPh₂ (n = 1-5)} in CH₂Cl₂ at room temperature afforded the mono-(2-Pentyne) complexes, [WCl₂(CO)(Ph₂P(CH₂)_nPPh₂) (η²-EtC₂Me)] ( n = 1-5) (4-8).