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The cover picture shows a new method to access 1,1‐difluoroolefins, which are important fluoro‐containing organic compounds. The N‐tosylhydrazones derived from trifluoromethyl ketones react with arylboronates in the presence of Rh(I) catalyst, affording 1,1‐difluoroolefins in moderate yields. This Rh(I)‐catalyzed cross‐coupling reaction is based on migratory insertion of Rh(I) carbene followed by β...
Rh(I)‐Catalyzed synthesis of 1,1‐difluoro‐2,2‐diarylalkenes from trifluoromethylketone N‐tosylhydrazones and arylboronates is presented in this communication. This new synthetic method is based on the Rh(I)‐carbene migratory insertion followed by β‐fluoride elimination. In one particular case the protonation occurs instead of β‐fluoride elimination, affording 2,2‐diaryl trifluoroethane product.
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