申请人:Hoechst Aktiengesellschaft
公开号:US05516932A1
公开(公告)日:1996-05-14
The present invention relates to compounds of the formula ##STR1## in which R.sup.1 and R.sup.2 are identical or different and are hydrogen or an alkyl radical having 1 to 18 carbon atoms and optionally containing oxygen, nitrogen or halogen, the radicals X, Y and Z are identical and are a fluorine, bromine or iodine atom or if two of the radicals X, Y or Z are identical or all of the radicals X, Y, Z are different from each other, X, Y and Z are a fluorine, chlorine, bromine or iodine atom. The invention further relates to a process for the preparation of the compounds, by reacting an aryldiazonium salt of the formula ##STR2## in which the radicals X, Y and Z are identical and are a fluorine, bromine or iodine atom or, if two of the radicals X, Y and Z are identical or all of the radicals X, Y, Z are different from each other, X, Y and Z are a fluorine, chlorine, bromine or iodine atom and A.sup.(-) is an anion of an acid having a pK.sub.a <7, with a compound of the formula ##STR3## in which R.sup.1 and R.sup.2 are identical or different and are hydrogen or an alkyl radical having 1 to 18 carbon atoms and optionally containing oxygen, nitrogen or halogen, in the presence of a palladium-containing catalyst, if appropriate with addition of a base, and the aryldiazonium salts of the formula (II).
本发明涉及以下结构的化合物:其中R.sup.1和R.sup.2相同或不同,为氢或具有1至18个碳原子的烷基基团,可能含有氧、氮或卤素;基团X、Y和Z相同,为氟、溴或碘原子,或者如果基团X、Y或Z中有两个相同,或者所有基团X、Y、Z互不相同,则X、Y和Z为氟、氯、溴或碘原子。本发明还涉及一种制备这些化合物的方法,通过将以下结构的芳基重氮盐与以下结构的化合物反应而制备:其中基团X、Y和Z相同,为氟、溴或碘原子,或者如果基团X、Y和Z中有两个相同,或者所有基团X、Y、Z互不相同,则X、Y和Z为氟、氯、溴或碘原子,A.sup.(-)为具有pK.sub.a<7的酸的阴离子,存在钯催化剂的情况下,必要时加入碱,以及结构(II)的芳基重氮盐。