Comparison of cyclic and polymeric disulfides as catalysts for the regioselective chlorination of phenols
Journal of Sulfur Chemistry, Volume 36, No. 1, Year 2015
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Two cyclic and two polymeric disulfides have been synthesized and established to be useful catalysts for the chlorination of m-xylenol, o-cresol, m-cresol and phenol using freshly distilled sulfuryl chloride in the presence of aluminum or ferric chloride as a co-catalyst at room temperature. The yields of p-isomers and para/ortho ratios were higher compared to cases where no catalyst was used with most catalysts for most phenols even when a very low concentration of disulfide was used.