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Ruthenium-catalyzed C-H/CO/Olefin Coupling Reaction Of N-arylpyrazoles. Extraordinary Reactivity Of N-arylpyrazoles Toward Carbonylation At C-H Bonds.

T. Asaumi, N. Chatani, T. Matsuo, F. Kakiuchi, S. Murai
Published 2003 · Chemistry, Medicine

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The reaction of 1-arylpyrazoles with CO and ethylene in the presence of Ru(3)(CO)(12) resulted in regioselective carbonylation at the ortho C-H bonds. While it is found that the pyrazole ring also functions as the directing group for C-H bond cleavage, the efficiency of the reaction depends on the position of the pyrazole ring.



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