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Transition-metal-catalyzed carbon-carbon cleavage offers unique opportunities to develop novel transformations,because it allows reorganization of bond connections leading to novel molecular structures with high complexity.However,such chemical transformations are usually difficult to achieve because of the inherent C-C bond strength.In most of the reactions,highly strained compounds such as three-or four-membered carbocycles and compounds with good leaving groups or chelating compounds have been employed as substrates.Therefore,the development of new reactions for the catalytic cleavage of the carbon-carbon bond remains a challenging subject of modern organic synthesis,especially for acyclic structures.