Process for the manufacture of cyano-substituted stilbene...

Details Process for the manufacture of cyano-substituted stilbene... Process for the manufacture of cyano-substituted stilbene...

C - Chemistry, Metallurgy

07

D

260/363, 8/52, 2

C07D 307/81 (2006.01) C07D 307/79 (2006.01) C07D 307/91 (2006.01) D06L 3/12 (2006.01)

Patent

CA 1047511

Abstract of the Disclosure A process for the manufacture of cyano-substituted stilbene compounds of the formula Image wherein A represents a phenyl, naphthyl, biphenyl, stilben - 4- yl, dibenzofuran -3-yl, 4-(benzo[b]furan-2-yl)-phenyl or 2-phenyl-benzo[b]furan-6-yl radical and the ring B is sub- stituted in o- or p-position with a cyano group by reacting a methyl compound of the formula Image - 2 - with a Schiff's base of the formula Image wherein Y1 represents chlorine or hydrogen, in dimethyl formamide and in the presence of sodium alcoholate at temperatures of 0 to 40°C as well as new cyano-substituted stilbene compounds of the above formula wherein A is a 4-(benzo[b]furan-2-yl)-phenyl radical and their use as optical brighteners are provided.

213820

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