Secondary phosphine chalcogenides

The coordination chemistry of secondary phosphine chalcogenides and their conjugate bases. B. Walther, Coord. Chem. Rev., 1984, 60, 67 (110). 

Secondary phosphine chalcogenide (chalcogenophosphinite) Trichalcogenophosphonic acid (trichalcogenophosphonate) Chalcogenoamidophosphinic acid (chalcogenoimidophosphinate)... 

Secondary phosphine chalcogenides (15a) can be readily prepared from oxidation of secondary phosphines (R2PH) with elemental sulfur, selenium or tellurium, although care must be taken to avoid over-oxidation to give the dichalcogenophosphinic acids (see Section 5.2.5). 

Secondary phosphine chalcogenides (15a) exist in equilibrium with their chalcogenophosphinous acid tautomers (15b). This equilibrium sits far on the side of the chalcogenide tautomer 15a for virtually all organo R groups, to such an extent that it is difficult to even detect the presence of the acid tautomer 15b... 

Figure 6 Coordination modes for secondary phosphine chalcogenides and chalcogenopho-sphinites...

Trofimov et al. prepared secondary phosphine chalcogenides with ary-lethyl- or hetarylethyl substituents and utilized them in the synthesis of tertiary phosphine chalcogenides containing a furyl group in on of the alkyl substituents (Scheme 22). ... 

Secondary phosphine chalcogenide Trichalcogenophosphonic acid Chalcogenoamidophosphinic acid chalcogenophosphinite) f trichalcogenophosphonate) (chalcogenoimidophosphinate)... 

Trofimov and co-workers accomplished the addition of secondary phosphine chalcogenides to 1-vinylimidazoles under radical conditions to obtain the corresponding adducts (Scheme 31). ... 

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