| 摘要 |
NEW MATERIAL:Compds. of formula I or II (wherein X and Y are each an alkyl, an aryl or a 4-substd. cyclohexyl; R1, R2, R5 and R6 are each H, an alkyl, an alkoxy or a halogen; R3, R4, R7 and R8 are each H, an alkyl which may be substituted by cyano, an alkoxyalkyl or an alkyl-substd. benzyl; Z is -OR9 or a group of the formula III, IV, V or VI; R9 and R10 are each an alkyl; and R11 and R12 are each an alkyl or an alkoxy). EXAMPLE:A compd. of formula VII. USE:Dichroic azo dyes useful for the polarizing film of liquid crystal display elements. PREPARATION:A compd. formula VIII is diazotized and then coupled with a compd. of formula IX.
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