| 摘要 |
The present invention relates to new azole derivatives of the naphthoxazole type which in the most general case correspond to the formula WHEREIN U denotes a diphenyl radical bonded in the 4,4'-position to the oxazole rings and U1 and U2 denote naphthalene radicals fused to the oxazole rings, and wherein up to four positions capable of substitution in U; U1 and U2 can be substituted with optionally substituted alkyl groups, halogen or optionally functionally modified sulphonic acid groups and up to 2 positions capable of substitution can be substituted with optionally substituted phenyl groups, phenylalkyl groups, -SO2 -phenyl, nitrile or optionally functionally modified carboxyl groups. The naphthoxazole compounds are useful as optical brightening agents.
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