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Herein, we describe a Zn-catalyzed atom-economical, inexpensive, and sustainable method for preparing a broad spectrum of substituted olefins utilizing alcohols as the main precursor. Using a Zn(II) complex ZnLCl 2 ( 1 ) of the redox-noninnocent ligand 2-((4-chlorophenyl)diazenyl)-1,10-phenanthroline ( L ), various ( E )-olefins were prepared in good yields by coupling alcohols with sulfones and aryl cyanides under an inert atmosphere. Under an aerial atmosphere, vinyl nitriles were isolated in up to 82% yield reacting alcohols with benzyl cyanides in the presence of 1 . Control experiments and mechanistic investigation indicate the active involvement of the aryl-azo ligand as an electron and hydrogen reservoir, permitting 1 to perform as a promising catalyst.
Pal et al. (Mon,) studied this question.