作者:G. A. Selivanova、L. M. Pokrovskii、V. D. Shteingarts
DOI:10.1023/a:1012492726911
日期:——
Ammonolysis of chloropentafluorobenzene both in the presence and in the absence of copper(I) salt results mainly in replacement of the para- and ortho-fluorine atoms with respect to chlorine rather than replacement of the chlorine atom. Ammonolysis of 4-chloro-2,3,5,6-tetrafluoroaniline and 2-chloro-3,4,5,6-tetrafluoroaniline in the absence of copper(I) salt yields exclusively the corresponding fluorine substitution products, whereas in the presence of copper(I) salt the chlorine atom is replaced. Successive ammonolysis of chloropentafluorobenzene in the presence of copper catalyst along these two paths was put into the basis of a new method for preparation of 2,3,5,6-tetrafluoro-1,4-phenylenediamine.
Selective mono- and diamination of some polyhalogenbenzenes in anhydrous ammonia
作者:Vladimir I. Rodionov、Tamara A. Vaganova、Evgenij V. Malykhin
DOI:10.1016/j.jfluchem.2015.09.003
日期:2015.12
investigated. The optimal conditions for selectivepreparation of mono- and diamino derivatives, which are ensured by the reaction temperature, were elucidated. In some examples of diamine synthesis, in order to improve the selectivity of second aminodefluorination, it is advisable to separate the isomeric monoamino derivatives produced in the first step of the synthesis.