| 摘要 |
<p>1382459 Bis-benzoxazolylnaphthalenes CIBAGEIGYAG 2 Aug 1972 [10 Aug 1971] 36039/72 Heading C2C [Also in Division C3] Novel 1,4-bis-benzoxazolyl-(2<SP>1</SP>)-naphthalenes of the formula wherein R denotes optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms alkenyl with 2 to 4 carbon atoms, cycloalkyl, aryl or aralkyl, Y denotes hydrogen, alkyl with 1 to 4 carbon atoms, halogen, carboxyl, carbalkoxy with 2 to 5 carbon atoms or the radical -SO 2 R<SP>1</SP>, wherein R<SP>1</SP> represents optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms, cycloalkyl, alkenyl with 2 to 4 carbon atoms, aryl or aralkyl, and X and X<SP>1</SP> independently of one another denote hydrogen, chlorine or alkyl with 1 to 4 carbon atoms are prepared by ring closure of compounds of formula where A is and B is The products are used as optical brightening agents or scintillators. Intermediates of formulae (7) and (10) are prepared by reacting where Z and Z<SP>1</SP> are independently OH 1 halogen or alkoxy with aminophenols of formula or the corresponding oxazolones Z and Z<SP>1</SP> being reacted simultaneously or successively as required. Various (substituted) alkylsulphonyl-2-aminophenols of Formula (15) are prepared by-nitrating 4-chloro-alkylsulphones, saponifying the Cl in the resulting 3-nitro-4-chloro-alkylsulphones to give alkylsulphonyl-2-nitrophenols and reducing these. Benzoxazolone is sulphochlorinated to give 6- chlorosulphonylbenoxazolone which is reacted with sodium sulphite go give benzoxazolone-6- sulphinic acid which is reacted with dimethyl sulphate to give 6-methylsulphonylbenzoxazolone which on treatment with NaOH give 2-amino-5- methylsulphonylphenol. 4-(Benzoxazolyl-(2<SP>1</SP>))-1-naphthoic acid chloride is prepared from thionyl chloride and the acid.</p> |
