Process for preparing alkanephosphonic anhydrides

Details Process for preparing alkanephosphonic anhydrides Process for preparing alkanephosphonic anhydrides

1995-11-02

1998-01-20

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Two phosphori bonded directly to the same divalent chalcogen...

C07F 938

Patent

active

057103305

ABSTRACT:
Process for preparing alkanephosphonic anhydrides of the formula (I) ##STR1## where R is straight-chain or branched unsubstituted C.sub.1 -C.sub.6 -alkyl and n.gtoreq.3, which comprises pyrolytically eliminating water from an alkanephosphonic acid of the formula (II) or a pyroalkanephosphonic acid of the formula (III) ##STR2## where R is straight-chain or branched C.sub.1 -C.sub.6 -alkyl, without addition of solvent and removing the water from the reaction mixture by means of an inert gas stream.

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patent: 4195035 (1980-03-01), Kleiner et al.
patent: 4267125 (1981-05-01), Dursch et al.
Grant, D., et al, J. Polymer Sci.:Part A-I 5:57-75 (1967).

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