A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 619-58-9, Name is 4-Iodobenzoic acid, molecular formula is C7H5IO2. In an article, author is Li, KT,once mentioned of 619-58-9, Product Details of 619-58-9.
Effect of iodide additives on the polymerization of 2,6-dimethylphenol with copper bromide n-butylamine catalyst
The effects of three iodide additives on the performances of two 2,6-dimethylphenol polymerization catalysts based on copper bromide were studied. The iodide additives were sodium iodide, potassium iodide and methyl iodide. The polymerization catalysts were CuBr2/n-butylamine and Cu2O/HBr/n-butylamine. Iodide addition resulted in the higher polymer molecular weight which decreased in the following order: NaI > KI > CH3I. Polymerization induction period increased significantly with NaI addition, but was insensitive to the concentrations of KI and CH3I. Addition of quaternary ammonium salt to the NaI-added catalyst dramatically shortened the induction period and greatly decreased the amount of copper catalyst needed. UV-VIS absorption spectroscopy showed that the Br–>I exchange occurred with the addition of NaI into the copper bromide-based catalyst. Besides, I–>Cl exchange was observed with the addition of methyltrioctylammonium chloride to the NaI-added catalyst. The I–>Cl exchange was caused by the binding of the iodide anion to the quaternary ammonium cation. Copper chloride/n-butylamine complex was generated after the I–>Cl exchange.
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