Phosphorane cage compounds

Phosphoramidous fluorides, 13 383-389 Phosphoranes, 16 47 cage compounds, 30 246 as propellanes, 33 268 Phosphorescence, 19 68 Phosphoric acid ester amides, reaction with hexafluoroacetone, 30 237 Phosphoric acids, condensed, properties of, 5 220... 

Phosphoranes are produced by reactions with PFj or SF4 (7.136) and cage compounds can be obtained with suitable amines. Some reactions produce phosphites in equilibrium with phosphoranes (7.139). 

Studies on the synthesis of cage-like phosphoranes based on casade reactions of trivalent phosphorus derivatives with unsaturated activated compounds has continued. For example, reactions of phosphites bearing dioxaphosphorinane (1), dioxaphospholane (2) and catechol derivatives (3) with hexafluoroacetone, chloral, mesoxalic and trifluoropyruvic acid esters have been performed to produce a series of novel carcass -type pentacoordinated phosphoranes with high regio- and stereoselectivity. Hence, upon treatment of hexafluoroacetone (4) with phosphites (1) and (2), pen-taoxophosphoranes (5) and (6) were formed (Scheme 1). 

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