| 摘要 |
Bisphosphinic acid anhydrides of the formula <IMAGE> (I) in which R is a saturated open chain or cyclic alkylene radical, an arylene or aralkylene radical, and R1 and R2, which may be identical or different, represent optionally halogen substituted alkyl, aryl or aralkyl radicals, and m represents an integer >/=1, preferably >/=2 and a process for their preparation which comprises reacting bisphosphinic acid derivatives of the formula <IMAGE> (II) in which R3 and R4, are hydrogen, monovalent cations, the ammonium group or optionally halogen-substituted alkyl groups, with inorganic acid chlorides and/or with phosgene and/or with oxalyl chloride and/or with the corresponding bromine compounds in a molar ratio of about 1:1 at a temperature up to 250 DEG C.
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