| 摘要 |
The invention relates to chromogenic 3,1-benzoxazines of the formula <IMAGE> wherein X1 denotes hydrogen, C1-C4-alkyl, chlorine or OY1, X2 denotes NY2Y3, X3 denotes OY4 or NY5Y6, R1-R3 independently of one another denote hydrogen, C1-C4-alkyl, chlorine, C1-C4-alkoxy or C1-C4-mono- or -dialkylamino, or R1 together with Y2, R2 or R3 together with Y4 or Y5, or R2 and R3 simultaneously with Y5 and Y6 denote a 2 to 4-membered bridge which can contain one oxygen atom or one nitrogen atom and can carry up to 4 methyl groups, and wherein R1 and R3 simultaneously represent hydrogen only if R2 with Y4 or Y5 forms one of the abovementioned bridges, R4 denotes hydrogen, methyl or chlorine, Y1 and Y4 independently of one another denote C1-C4-alkyl, cyclohexyl or benzyl and Y2, Y3, Y5 and Y6 independently of one another denote hydrogen, C1-C4-alkyl, cyclohexyl or benzyl, are used for pressure-copying, thermoreactive or electrochromic recording materials. |
