公开(公告)号：CA2162082C

公开(公告)日：2006-08-08

申请号：CA2162082

申请日：1995-11-03

Applicant: HOECHST AG

Inventor： MOLLENKOPF CARL CHRISTOPH ,  LEUPOLD ERNST INGO ,  ROSCHER GUNTER

IPC: C07F9/38

Abstract: 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 .gtoreq. 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.

公开(公告)号：CA2162082A1

公开(公告)日：1996-05-05

申请号：CA2162082

申请日：1995-11-03

Applicant: HOECHST AG

Inventor： MOLLENKOPF CARL CHRISTOPH ,  LEUPOLD ERNST INGO ,  ROSCHER GUENTER

IPC: C07F9/38

Abstract: Process for preparing alkanephosphonic anhydrides Process for preparing alkanephosphonic anhydrides of the formula (I) ( I ) where R is straight-chain or branched unsubstituted C1-C6-alkyl and n 2 3, which comprises pyrolytically eliminating water from an alkanephosphonic acid of the formula (II) or a pyroalkanephosphonic acid of the formula (III) (II) (III) where R is straight-chain or branched C1-C6-alkyl, without addition of solvent and removing the water from the reaction mixture by means of an inert gas stream.