Organo-phosphorus compoundsOrgano-phosphorus compounds S 0080 Dilithiated Phosphazenes: Scaffolds for the Synthesis of Olefins Through a New Class of Bicyclic 1,2-Oxaphosphetanes. -The dianions derived from phosphazenes (I) react with carbonyl compounds (II) to yield spirocyclic 1,2-oxaphosphetanes (III), which furnish quantitatively substituted olefins [cf. (IV)] through stereospecific thermolysis. -(GARCIA-LOPEZ, J.; PERALTA-PEREZ, E.; FORCEN-ACEBAL, A.; GARCIA-GRANDA, S.; LOPEZ-ORTIZ*, F.; Chem. Commun. (Cambridge) 2003, 7, 856-857; Area Quim. Org., Univ. Almeria, E-04120 Almeria, Spain; Eng.) -M. Schroeter 30-199

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The first examples of the PN-directed dilithiation of (N-methoxycarbonyl)phosphazenes in the C(alpha) and C(ortho) to the phosphorus, and the use of these dianions in the formation of tri- and tetra-substituted olefins through stereospecific thermolysis of a new type of isolable bicyclic 1,2-oxaphosphetanes are described.

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