Fig. 4: Scope for cobalt-catalyzed enantioselective [2 + 2] cycloaddition of alkyne and cyclobutenes.
From: Pathway-divergent coupling of alkynes and cyclobutenes through enantioselective cobalt catalysis
aThe reactions were performed in the presence of 10 mol % dppf instead of 4i. DME dimethoxyethane, SEM trimethylsilylethoxymethyl.
