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Complexes of Nickel(II), Palladium(II), and Platinum(II) with the β-Ketophosphines PBut2(CH2COR) (R=Ph or But)
Moulton, Christopher J.,Shaw, Bernard L.
, p. 299 - 301 (2007/10/02)
The β-ketophosphines PBut2(CH2COR) (R=Ph or But) have been prepared by treating the α-bromoketones BrCH2COR with PBut2H and subsequent treatment with base.With hydrated nickel(II) chloride, complexes of the type trans-, in which the nickel is chelated by the tertiary phosphine enolate ion, are formed rapidly.In contrast, with or these β-ketophosphines, even on prolonged boiling in alcohols, give complexes of type trans-t2(CH2COR)>2>.However, when these chlorocomplexes are treated with sodium 2-methoxyethoxide, ring closure occurs to give the bis(chelates) trans-.Proton and 31P n.m.r. and i.r. data are given.
