Diethylacetyl phosphite and diethyl chlorophosphite react with biacetyl, intermediately forming, as do other derivatives of phosphorous acid, 1,3,2-dioxaphospholenes with a pentacoordinated phosphorous atom; the latter are rapidly transformed to noncyclic or cyclic derivatives of tetracoordinated phosphorous.
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Levin, Y.A., Gozman, I.P. & Salikhov, S.G. Penta- and tetracoordinated phosphorous in reactions of biacetyl with diethylacetylphosphite and diethyl chlorophosphite. Russ Chem Bull 17, 2466–2468 (1968). https://doi.org/10.1007/BF00903403
- Phosphorous Acid