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Updated: Sep 14, 2025

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
Published on: May 26, 2019
Recent Advances in the Synthesis of Nitrile Compounds Utilizing K4[Fe(CN)6]: Mechanistic Studies and Applications
Yan Zhang1, Fachao Yan1, Yue Zhang1
1School of Chemistry and Chemical Engineering, Shandong University of Technology, 266 West Xincun Road, Zibo, 255049, P. R. China.
Abstract:
The pursuit of sustainable synthetic methodologies has propelled K4[Fe(CN)6] to the forefront as an environmentally benign cyanating reagent in modern organic synthesis. This review systematically evaluates recent advances (2004-2025) in K4[Fe(CN)6]-mediated cyanation reactions, with particular emphasis on its mechanistic versatility and green chemistry advantages over conventional cyanide sources. We present a comprehensive analysis of its application across four key bond functionalizations: 1) C─X (X = halogen, pseudo-halogen) bond cyanation, 2) C─C bond cleavage/cyanation strategies, 3) C─O bond activation in phenols aryl mesylates, and 4) direct C─H cyanation through transition metal-catalyzed or transition metal free catalyzed pathways. Detailed comparisons of catalytic systems highlight structure-reactivity relationships, with quantitative evaluation of substrate scope, yield distributions for most systems, and selectivity profiles. Emerging applications in pharmaceutical intermediate synthesis and scalability underscore its industrial potential, positioning K4[Fe(CN)6] as a cornerstone reagent for sustainable nitrile synthesis in academic and industrial settings.
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