| 摘要 |
<p>1,208,698. Cyano-coumarins. FARBENFABRIKEN BAYER A.G. 6 May, 1969 [6 May, 1968], No. 23063/69. Heading C2C. [Also in Division C3] Novel compounds of formula wherein Ar is an optionally substituted aromatic carbocyclic or aromatic heterocyclic radical, and the coumarin ring may contain further substituents, one prepared from the corresponding 7- amino-coumarin by diazotization followed by reaction with a metal cyanide. The compounds of the invention are used to stabilize organic compounds against light.</p> |
