Demonstrates efficient dimerization of alkynic hydrazones to synthesize bipyrazoles, suggesting versatile applications in chemistry.
Palladium-catalyzed cyclizative dimerization of alkynic hydrazones afforded 4,4'-bipyrazoles. The desired dimerization reaction proceeded efficiently by using the Pd(tfa)₂/DPPF catalyst. Several functional groups were tolerated under the reaction conditions, and various bipyrazoles, including fully substituted bipyrazoles, were successfully synthesized.
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Kusakabe et al. (2026) studied this question.
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