摘要 |
The invention comprises compounds of the general formula <FORM:1049149/C2/1> and quaternization products thereof, where R1 and R2 are hydrogen, alkyl radicals of up to 3 carbon atoms, aralkyl or aryl radicals, R3 and R4 are hydrogen or alkyl radicals of up to 3 carbon atoms. They may be prepared by condensing 4-(1-v-triazolyl)-2-alkoxybenaldehydes with arylacetonitriles and cyclizing after the alkoxy group has been split. Examples are given of the preparation of 7-(1-v-triazolyl)-3-phenyl-coumarin and 7-(1-v-triazolyl)-3-p-tolylcoumarin and their quaternization products with dimethyl and diethyl sulphate.ALSO:Compounds of the general formula <FORM:1049149/C3/1> where R1 and R2 are hydrogen, alkyl radicals of up to 3 carbon atoms, aralkyl or aryl radicals, R3 and R4 are hydrogen or alkyl radicals of up to 3 carbon atoms, and their quaternization products are useful brightening agents for polyacrylonitrile. In an Example (3), the brightening agent is incorporated in a spinning solution of polyacrylonitrile in dimethyl formamide.ALSO:Compounds of the general formula:- <FORM:1049149/D1-D2/1> where R1 and R2 are hydrogen, alkyl radicals of up to 3 carbon atoms, aralkyl or aryl radicals, R3 and R4 are hydrogen or alkyl radicals of up to 3 carbon atoms, and their quaternization products, are useful brightening agents for polyester fibres and for polyacrylonitrile fibres. See Examples 1 and 2. |