Tuning Chemoselectivity in Iron-Catalyzed Sonogashira-Type Reactions Using a Bisphosphine Ligand with Peripheral Steric Bulk: Selective Alkynylation of Nonactivated Alkyl Halides
The incredible bulk: A highly C‐center‐selective alkynylation of nonactivated alkyl halides with the corresponding Grignardreagents is achieved by using the iron‐phosphine complex 1. Primary and secondary alkyl iodides, bromides, and chlorides take part in the reaction to give the substituted alkynes in good to excellent yields. Sequential cyclization/cross‐coupling reactions are also demonstrated