Process for the preparation of pure propanephosphonic anhydride

Details Process for the preparation of pure propanephosphonic anhydride Process for the preparation of pure propanephosphonic anhydride

1992-08-05

1994-06-07

Dees, Jose G.

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

Organic compounds

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

C07F 930

Patent

active

053191382

ABSTRACT:
Process for the preparation of pure propanephosphonic anhydride, which comprises distilling crude, impure propanephosphonic anhydride having an average degree of polymerization of 20 to 200 and containing less than 0.5% by weight of water by heating to 230 to 300.degree. C. under a pressure of 0.1 to 100 mbar, pure propanephosphonic anhydride having an average degree of polymerization of 20 to 60 being obtained.

REFERENCES:
patent: 4195035 (1980-04-01), Kleiner et al.
patent: 4267125 (1981-05-01), Dursch et al.
patent: 4331592 (1982-05-01), Wissmann et al.
Derwent Abstract of German laid-open application 27 58 580, Jul. 1979.

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