Aromatic sulfinic acid compound and preparation method thereof

The invention relates to a preparation method of an aromatic sulfinic acid compound, which comprises the following steps: dissolving an aromatic compound in a liquid coordination complex, and introducing sulfur dioxide to carry out Friedel-Crafts acylation reaction under the protection of inert gas to prepare the aromatic sulfinic acid compound. According to the preparation method, the liquid coordination complex prepared from the metal and the organic ligand is used as the catalyst and the solvent, other organic solvents do not need to be additionally added, the reaction rate is high, the yield is high, the product purity is high and can reach 97% on the whole, aftertreatment is simple, and the preparation method is suitable for large-scale production. 本发明涉及一种芳香亚磺酸类化合物的制备方法，包含如下制备步骤：将芳香族化合物溶于液体配位络合物中，在惰性气体保护条件下，通入二氧化硫进行傅克酰基化反应，制备芳香亚磺酸类化合物。该制备方法以金属和有机配体制备而成的液体配位络合物作为催化剂和溶剂，无需另外添加其它有机溶剂，反应速率快、收率高，产品纯度高，整体可达97％，且后处理简单，适合大规模生产。