| abstract |
NEW MATERIAL:The compound of formula I (R is alkyl, substituted alkyl or acyl). n EXAMPLE: 3-(p-Cyanophenyl)-1,2-dihydro-7-ethoxynaphthalene. n USE: Material for electro-optical display element. Also useful as a fluorescent material for organic material such as fiber, synthetic resin, paint, etc. Since the compound absorbs ultraviolet ray and emits strong fluorescence, it gives clear patterns of figures, letters, etc. having high contrast. n PREPARATION: 3,4-Dihydro-6-methoxy-2(1H)-naphthalenone of formula II and p- dibromobenzene are subjected to Grignard reaction and the reaction product is dehydrated to obtain the compound of formula III, which is converted to a compound of formula I (R is CH 3 ) by the addition of cuprous cyanide. The product can be converted to another compound of formula I by hydrolyzing with boron tribromide followed by alkylation or acylation. n COPYRIGHT: (C)1984,JPO&Japio |