Amino-4-iodopyrazoles, coupling with acetylenes

A similar phenomenon was observed for 3-amino- and5-amino-4-iodopyrazoles. The anomalous reaction in which the products of oxidative coupling of terminal acetylenes (up to 90%) are present along with the products of deiodination (up to 90%) has been described for the first time [99JCS(P1 )3713] and will be considered below in the part related to cross-coupling of 4-iodopyrazoles. 

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