| abstract |
1284253 Dipyridyl dialdehydes RHONEPOULENC SA 27 July 1970 [28 July 1969 26 Aug 1969] 49758/71 Divided out of 1284252 Heading C2C Novel dialdehydes of formula in which Ar represents a divalent radical comprising at least one aromatic nucleus, are prepared by reacting a dialdehyde of formula OHC-Ar-CHO with 4,4<SP>1</SP>-dimethyl-2,2<SP>1</SP>-dipyridyl. The dialdehydes are polymerizable as described in Specification 1,284,252. |