Assignment of configuration to 2,2,3,4,4-pentamethylphosphetan oxides using tris(dipivalomethanato)europium(III)

Abstract

cis- and trans-isomers of 2,2,3,4,4-pentamethyl-phosphetan oxides can be distinguished by the paramagnetic shifts of the respective 3-protons in their n.m.r. spectra in the presence of tris(dipivalomethanato) europium(III), Eu(DPM)3.