Lasing dyes derived from ter-and quaterphenyl

摘要

Methods for preparing <IMAGE> wherein n is 3 or 4 and R is H, CH3 or C2H5. The methods involve forming <IMAGE> by reacting p-terphenyl or quaterphenyl with acetic acid and fuming nitric acid, forming <IMAGE> by refluxing the dinitro derivative with stannous chloride, hydorchloric acid and acetic acid and forming the dialkylamino derivative by refluxing the diamino derivatives with a suitable trialkyl phosphate. Also, <IMAGE> derivatives may be prepared by refluxing the diamino derivatives with sodium nitrite and hydrochloric acid to form <IMAGE> AND REACTING THIS INTERMEDIATE WITH A MIXTURE OF ACETIC ACID AND EITHER WATER OR ALCOHOL. The compounds are useful as lasing dyes.