Photoinduced Copper(II) Catalyzed Decarboxylative Homocoupling of Arylpropiolic Acids: A Facile Access to the Symmetrical 1,3‐Diynes

Abstract

AbstractWe have developed an efficient visible light induced copper‐mediated protocol to synthesize conjugated 1,3‐diynes via decarboxylative homocoupling of arylpropiolic acids. A variety of electron‐rich and electron‐deficient acids worked well in this methodology providing desired product upto 99% yield. Detailed mechanistic investigations including UV‐Vis spectroscopy and in‐situ IR experiments have been carried out to elucidate the plausible reaction mechanism. Compared to previously reported thermal strategies, this new pathway occurs at room temperature, employs greener solvent and aerial oxygen as an oxidant.