Diselenadiphosphetane diselenide

Phosphaindolizines ([l,3]azaphospholo[l,5- ]pyridines) 40 reacted with hydrogen sulfide and elemental sulfur to produce zwitterionic systems 43. No reaction was observed with sulfur alone. The thiolate was trapped with iodomethane in a couple of cases (to give 47, Scheme 1) <1998HAC445>. An analogous P-diselenate was obtained from 48 using l,3,2,4-diselenadiphosphetane-2,4-diselenide 49, but under different conditions and in the presence of base the C-substituted product 50 was obtained (Scheme 2). 

Developments in the coordination chemistry ofphosphinines 13EJI187. The evolution and chemistry of WooUins reagent (2,4-diphenyl-1,3,2,4-diselenadiphosphetane 2,4-diselenide) 12SL1154. Phosphorus-containing macrocychc compoimds Synthesis and properties 13UK150. 

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