Bidentate neutral organophosphorus compounds

Diphcnyl-/V,/V-di obutylcarbamoylmcthylphosphinc oxide (Ph2-CMPO, Figure 3.3), a bidentate neutral organophosphorus compound (BNOPC) derived from the TRUEX process, which proved to be efficient for the removal of actinides and REEs. 

FIGURE 3.6 Bidentate neutral organophosphorus compounds (BNOPCs) diphosphine dioxides. 

It is well-known that certain bidentate neutral organophosphorus compounds are far better extractants than their monodentate analogues (1, ). 

Bidentate neutral organophosphorus compounds were synthesized in the laboratory of organophosphorus compounds, USSR Academy of Sciences as described in ( -11), the tri- and tetradentate compounds as described in (11). The reagents were dissolved in chloroform or cTTchloroethane. 

Turanov, A.N. Karndashev, V.K Baulin, V.E. (2008). Effect of Ionic Liquids on the Extraction of Rare-earth Elements by Bidentate Neutral Organophosphorus Compounds from Chloride Solutions. Russ.. Inorg. Chem., Vol.53, pp. 970-975... 

Bidentate phosphate compounds. The organophosphorus bidentate extractants are neutral species extractants that undergo no keto-enolization and have no exchangeable hydrogens (as is the case in extraction by the bidentate diketones). They contain either two P=0 groups or one P=0 and one C=0 group. The carbamoylmethyl-phosphonates (CMPs) and carbamoylphosphonates (CPs) are examples of the latter, while the tetraalkyldiphosphonates and tetraalkyl-diphosphinedioxides [or bis-(disubstituted phosphinyl)-alkanes] are examples of the former. 

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