申请人:Societe Nationale Elf Aquitaine (Production)
公开号:US05113019A1
公开(公告)日:1992-05-12
The invention relates to the preparation of alkylthiophenols by reaction of a dialkyl disulphide with a phenol. In the process according to the invention, the reaction is carried out in the presence of aluminum chloride or of ferric chloride in a solvent of the alkylbenzene type or, soley in the case of methylthiolation, in an excess of dimethyl disulphide. This process makes it possible, in particular to obtain, with a selectivity and in a yield which are excellent, 2-alkylthiophenols which may then be converted into 4-acyl-2-alkylthiophenols by means of a reaction at a temperature ranging from 40.degree. to 100.degree. C. with a complex BF.sub.3 :2RCOOH where R denotes an alkyl or propenyl radical, in a proportion of 10 to 15 moles of complex per mole of 2-alkylthiophenol.
该发明涉及通过二烷基二硫化物与酚的反应制备烷基硫代苯酚。根据该发明的工艺,反应在铝氯化物或三氯化铁存在下,在烷基苯类溶剂中进行,或者仅在甲硫基化的情况下,在过量的二甲基二硫化物中进行。该工艺特别能够以优异的选择性和产率获得2-烷基硫代苯酚,然后可以通过与复合物BF.sub.3:2RCOOH(其中R代表烷基或丙烯基基团)在40至100摄氏度的温度下反应,每摩尔2-烷基硫代苯酚使用10至15摩尔复合物,将其转化为4-酰基-2-烷基硫代苯酚。