Triaminooxyphosphonium dipolar ions and triaminodioxy phosphoranes from the reaction of triaminophosphines with α-diketones

Reactions of phosphite esters and trisdialkylaminophosphines with 5‐substituted 1,3,4‐thiadiazol derivatives

“…The presence of one signal in its 31 P NMR spectrum indicates that the equilibrium between the two forms is established rapidly relative to the time scale of the NMR phenomenon. A similar finding has been reported for the coexistance in solutions of a similar structure containing quadruply-connected phosphorus and the corresponding valence tautomer containing quintuply-connected phosphorus [22].…”

Reaction Kinetics of Oxyphosphoranes with Model Compounds of Nucleosides

“…Oxyphosphorane 1 (8), 16 (8), and 14 (11) were prepared by the reported procedure. The structures of compounds 2, 3, 10, 13, 17, and 18 were confirmed by authentic samples.…”

Synthesis and Reactions of Acenaphthenequinones. Part 2. The Reactions of Acenaphthenequinones

“…Treatment of 1 with sodium in tetrahydrofuran followed by Cl 2 P (X) OR gave a fused di-oxophospholes 171 [138]. The reaction of 1 with 2-N-pyrrolidino-1,3-dimethyl-1,3,2-diazaphospholane (172) was quite vigorous in methylene chloride solution even at -70°C (Scheme 46) [139]. When the solution was allowed to reach 20°C, a deep brown mixture was produced from which the only isolable product was 2-N-pyrrolidino-2-oxo-1,3-dimethyl-1,3,2-diazaphospholane (176).…”