| 摘要 |
<p>1425278 Mercaptophenols CROWN ZEL LERBACH CORP 8 March 1974 [12 March 1973] 10498/74 Heading C2C Mercaptophenols are produced from phenols by contacting at least one phenol having the Formula (I): in which R is hydrogen or an alkyl, cycloalkyl or haloalkyl group containing up to 10 carbon atoms, and -R<SP>1</SP> n represents up to 4 optional substituents, each being halogen or a hydroxy group or an alkyl, alkoxy, aryl or cycloalkyl group each containing up to 20 carbon atoms, provided at least one position ortho or para to the OR group is occupied by a hydrogen atom, with a sulphur chloride in a polar solvent having a "water solubility" of at least 2À0, the phenols comprising up to 25% by weight of the reaction mixture; reducing the resulting polysulphides to mercaptophenols; and isolating the mercaptophenols from the reaction mixture. The polar solvent is defined as one which has a solubility in water of at least 2À0 based on grams of solvent dissolved per 100 gms. of water at a temperature of approximately 25‹ C. If desired, hydrogen chloride may be used as a promoter. Examples describe the conversion of (a) phenol to 4-mercaptophenol; (b) 2,4-dimethylphenol to 6- mercapto - 2,4 - dimethylphenol; (c) 2,6-dimethylphenol to 4 - mercapto - 2,6 - dimethylphenol; (c) anisole to 4-mercapto-anisole; and (d) catechol to 4-mercaptocatechol.</p> |
