Samarium diiodide mediated free radical cracking of lignin beta-O-4 ketone model compound

The invention discloses a method for obtaining a ketone compound and a phenolic compound through free radical cracking of a lignin beta-O-4 ketone model compound mediated by samarium diiodide, and application of the samarium diiodide in obtaining the ketone compound and the phenolic compound through free radical cracking of the lignin beta-O-4 ketone model compound mediated by the samarium diiodide. According to the method, samarium diiodide is used as an inducer, and keto-carbonyl free radical addition is promoted by using the oxytropism and single electron donor characteristics of samarium diiodide, so that ether bond free radical cracking of the lignin beta-O-4 ketone model compound is initiated, and lignin platform monoaryl chemicals such as phenol and acetophenone are obtained. The method is simple to operate, mild in reaction condition and high in free radical degradation conversion rate, free radical dimerization side reaction is avoided, and the monoaryl chemicals can be obtained with high selectivity