The Stille reaction couples organotin reagents with all but one of the following. Which is not a common coupling partner?

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The Stille reaction primarily involves coupling of organotin reagents with organic halides (such as -Br and -Cl) and to a lesser extent with -OTf (a triflate leaving group). However, -F has poor leaving group ability and is not a common coupling partner in the Stille reaction. Additionally, -I is a stronger nucleophile than -OTf, but it can still be used in Stille coupling reactions.

The Stille Reaction Couples Organotin Reagents with All but One