Suzuki coupling: spot the wrong ligand

Single question

One-step Suzuki coupling between 2-bromotoluene and phenylboronic acid delivers 2-methylbiphenyl. The reaction class, base, and substrates are all right. Check the ligand on the palladium.

Suzuki coupling

Buchwald biaryl monophosphine ligands

Steric effects on cross-coupling

Find the flaw

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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