Other Metal Complexes of Tertiary Phosphines and Arsines Containing one Olefinic Group

Other Metal Complexes of Tertiary Phosphines and Arsines Containing one Olefinic Group 

The work on complexes of metals of other groups with olefinic tertiary phosphines and arsines has until recently been neglected, but it has now become dear that the chelating properties of these ligands are almost as widespread as those of the more well known bis(phosphine) and bis(arsine) ligands, such as diphos and diarsine. 

Wild (34) studied the reactions of vp and ap with the iron carbonyls under a wide variety of conditions in an attempt to prepare Fe(CO)3 

The halogenation reactions of the monomeric products has not been reported, but oxidation occurs on treatment of Fe(CO)3(vp) and Ru(CO)3 vp with HCl or HBr to give M(Il)-carbon r-bonded species, the halogen becoming attached to the metal in an octahedral environment. The ring-size was not reported. 

Triosmium dodecacarbonyl reacts with the simple ligand vp in an atypical manner 37) the trimeric osmium nucleus is retained and the olefin attacked to give a complex of formula Os3(CO)8(vp), which has two hydrides attached to osmium atoms. These are possibly a and one / -hydrogen of the olefin, the remainder being r-bonded to the trimeric osmium core. 

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