Abstract
AbstractA photoinitiated anti‐hydropentafluorosulfanylation of terminal alkynes using SF5Cl and (TMS)3SiH as the hydrogen atom donor is reported. This transformation generates selectively (Z)‐(1‐alken‐1‐yl)pentafluoro‐λ6‐sulfanes (Z:E : >85:15), thus allowing the preparation of this previously unknown geometrical isomer. DFT calculations highlight that the selectivity is due to the intrinsic preference of SF5‐substituted vinylic radicals to adopt a cis geometry, and to increased steric contacts during the transition structures leading to the minor (E)‐products.
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