申请人:Hoechst Celanese Corporation
公开号:US04794205A1
公开(公告)日:1988-12-27
A method is provided for preparing alkenylthiophenols, e.g., para-vinylthiophenol, or their esters, e.g., para-vinylthiophenol acetate by reacting a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone (4-HAP) with an N,N-di(organo)thiocarbamoyl halide, e.g., N,N-dimethylthiocarbamoyl chloride (DMTC) to form an O-(acylaryl) N,N-di(organo)thiocarbamate, e.g., O-(4'-acetophenyl) N,N-dimethylthiocarbamate, and pyrolytically rearranging the latter compound to form an S-(acylaryl) N,N-di(organo)thiocarbamate, e.g., S-(4-4- -acetophenyl) N,N-dimethylthiocarbamate. In one procedure, the latter compound is directly reduced to form an S-(1-hydroxyalkylaryl) N,N-di(organo) thiocarbamate, e.g., S-[4'-(1-hydroxyethyl)phenyl] N,N-dimethylthiocarbamate, which is either hydrolyzed to form a (1-hydroxyalkyl) thiophenol, e.g., 4'-(1-hydroxyethyl) thiophenol, which optionally after acylation of its thiol group, is dehydrated to form the alkenylthiophenol wherein the double bond is at the ring-bonded carbon atom, e.g., para-vinylthiophenol, or the S-(1-hydroxyalkylaryl) N,N-di(organo) thiocarbamate is dehydrated to form an S-(alkenylaryl) N,N-di(organo) thiocarbamate, e.g., S-(4-vinylphenyl) N,N-dimethylthiocarbamate which is hydrolyzed to form the alkenylthiophenol. In an alternative procedure, the S-(acylaryl) N,N-di(organo)thiocarbamate is hydrolyzed and the resulting thiol acylated with an acylating agent, e.g., acetyl chloride, to produce an acylthiophenol ester, e.g., 4-acetothiophenol acetate, which is then reduced and hydrolyzed to produce the (1-hydroxyalkyl) thiophenol. The latter compound is then dehydrated to produce the alkenylthiophenol, or acylated and dehydrated to produce alkenylthiophenol thioester, as described in the first procedure.
提供了一种制备烯基硫代苯酚,例如对-乙烯基硫代苯酚,或其酯,例如对-乙烯基硫代苯酚醋酸酯的方法,通过将羟基芳香酮,例如4-羟基乙酰苯酮(4-HAP)与N,N-二(有机)硫代氨酰卤化物,例如N,N-二甲基硫代氨酰氯(DMTC)反应形成O-(酰基芳基)N,N-二(有机)硫代氨酰酸盐,例如O-(4'-乙酰苯基)N,N-二甲基硫代氨酰酸盐,并通过热解重排后者化合物形成S-(酰基芳基)N,N-二(有机)硫代氨酰酸盐,例如S-(4-4- -乙酰苯基)N,N-二甲基硫代氨酰酸盐。在一个程序中,后者化合物直接还原形成S-(1-羟基烷基芳基)N,N-二(有机)硫代氨酰酸盐,例如S-[4'-(1-羟基乙基)苯基]N,N-二甲基硫代氨酰酸盐,它可以水解形成(1-羟基烷基)硫代苯酚,例如4'-(1-羟基乙基)硫代苯酚,之后经过硫醇基的酰化,脱水形成烯基硫代苯酚,其中双键位于环键合碳原子,例如对-乙烯基硫代苯酚,或将S-(1-羟基烷基芳基)N,N-二(有机)硫代氨酰酸盐脱水形成S-(烯基芳基)N,N-二(有机)硫代氨酰酸盐,例如S-(4-乙烯基苯基)N,N-二甲基硫代氨酰酸盐,将其水解形成烯基硫代苯酚。在另一种程序中,S-(酰基芳基)N,N-二(有机)硫代氨酰酸盐被水解,生成的巯基与酰化剂,例如乙酰氯,酰化,产生酰硫代苯酚酯,例如4-乙酰硫代苯酚醋酸酯,然后还原和水解产生(1-羟基烷基)硫代苯酚。后者化合物然后脱水产生烯基硫代苯酚,或酰化和脱水产生烯基硫代苯酚硫酯,如第一程序中所述。