A number of p-substituted benzalbarbituric acid derivatives were synthesized by the reaction of p-substituted benzaldehyde with barbituric acid, and their nonlinear optical properties were investigated by using the Kurtz powder test. p-acetamidobenzalbarbituric acid derivatives were found to exhibit the relatively high second-harmonic intensity and have the higher thermal stability.
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Kondo et al. (1990) studied this question.
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