申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0203827A1
公开(公告)日:1986-12-03
The process of the invention involves the preparation of ortho(alkylthio)phenols by reacting a phenol fo the formula:
wherein
X and Y are independently H, OH, C1-C6 alkyl, OR1, SR1, Cl, F, I, Br or aryl substituted with C1-C6 alkyl, OR1, SR1, Cl, F, I or Br, or when X and Y are on adjacent carbon atoms, they may be taken together to form CH=CH-CH=CH; and
R1 is C1-C6 alkyl;
provided that X and Y cannot simultaneously be OH; is reacted with a dialkyl disulfide of the formula, (RS)2
wherein R is C1-C6 alkyl;
provided that when R is C4-C6 alkyl, the carbon bonded to the heteroatom must be substituted by one or two hydrogen atoms
at an elevated temperature and in the presence of an effective amount of a zirconium phenoxide catalyst.
本发明的工艺包括通过使一种苯酚发生如下反应来制备邻(烷硫基)苯酚:
式中
X和Y独立地为H、OH、C1-C6烷基、OR1、SR1、Cl、F、I、Br或被C1-C6烷基、OR1、SR1、Cl、F、I或Br取代的芳基,或当X和Y位于相邻碳原子上时,它们可一起形成CH=CH-CH=CH;以及
R1 是 C1-C6 烷基;
条件是 X 和 Y 不能同时为 OH;与式 (RS)2 的二烷基二硫化物反应
其中 R 为 C1-C6 烷基;
但当 R 为 C4-C6 烷基时,与杂原子结合的碳必须被一个或两个氢原子取代
在高温和有效量的苯氧化锆催化剂存在下进行。