Organotin compounds are metal-organic compounds formed by the direct combination of tin and carbon. The general formula rn x4-n(n = 1-4, r is alkyl or aryl). There are two kinds of alkyl tin compounds and aromatic compounds. Its basic structure includes one substituent, two substituents, three substituents and four substituents (referring to the number of R). 10-20% of the tin output is used to synthesize organotin compounds.