Process for preparing alkanephosphonic anhydrides

Details Process for preparing alkanephosphonic anhydrides Process for preparing alkanephosphonic anhydrides

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2162082

Process for preparing alkanephosphonic anhydrides of the formula (I) (see formula I) where R is straight-chain or branched unsubstituted C1-C6-alkyl and n >= 3, which comprises pyrolytically eliminating water from an alkanephosphonic acid of the formula (II) or a pyroalkanephosphonic acid of the formula (III) (see formula II,III) where R is straight-chain or branched Cl-C6-alkyl, without addition of solvent and removing the water from the reaction mixture by means of an inert gas stream.

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