Highly selective one-pot synthesis of spirophosphoranes exhibiting reversed apicophilicity by oxidation of dianions generated from P-H spirophosphorane

[GRAPHICS] Mild and highly selective one-pot procedures for obtaining phosphoranes tha t exhibit reversed (O-cis) apicophilicity are described. On the basis of th e procedures, O-cis phosphorane bearing an aryl group (R = 2,4,6-tri-i-prop ylphenyl) could be isolated for the first time; the procedure is also appli cable for alkyl derivatives. Particularly effective was the use of I-2 as a n oxidizing reagent.