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Abstract
The reaction of tetraoxyspirophosphoranes containing P[sbnd]H bond 1, 4, 5 and 6 with acetylene carboxylates at 20–25° afforded the new vinylspirophosphoranes containing P[sbnd]C bond 9 to 16, whereas oxazaspirophoranes 2 and 3 into same conditions give rise to the enamine phosphites 17, 18 and 19.
The influence of different factors on the reaction pathway, the stereochemistry and the mechanisms are discussed.