In this context, a phosphonium coupling partner is a compound containing a phosphorus atom (typically as a phosphine or phosphine oxide) that plays a crucial role in the coupling reaction. This coupling partner can be used to transfer a phosphorus-containing group to the target molecule, leading to the formation of a new C-C bond.
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2-methyl-6-(5-p-tolyl-1,3,4-thiadiazol-2-yl)pyridazin-3(2H)-one
