申请人:BASF Aktiengesellschaft
公开号:US05840913A1
公开(公告)日:1998-11-24
A process for the preparation of an N-alkyl- or N-phenylalkyl-substituted pyrazole I by reacting the corresponding N-unsubstituted pyrazole II with an alcohol III of the formula R.sup.1 --OH where R.sup.1 is the same alkyl or phenylalkyl group to be added to the unsubstituted nitrogen group --NH-- of the pyrazole reactant. Both of the reactants, i.e. the pyrazole II and alcohol III compounds, are catalytically reacted in the liquid phase in a molar ratio of from 0.001:1 to 1:1, at temperatures of 50.degree.-400.degree. C. and under a subatmosheric pressure of from 0.8 bar up to a superatmospheric pressure of 250 bar. The catalyst required for this liquid phase reaction is selected as being at least one or more non-heterogeneous acid catalysts, their alkyl esters or their acid anhydrides.
通过将相应的N-未取代吡唑II与具有化学式R.sup.1-OH的醇III反应,制备N-烷基或N-苯基烷基取代的吡唑I的方法。其中,R.sup.1是要添加到吡唑反应物的未取代氮基-NH-的相同烷基或苯基烷基。这两种反应物,即吡唑II和醇III化合物,在液相中以摩尔比0.001:1至1:1进行催化反应,反应温度在50°C至400°C之间,并在0.8巴至250巴的亚大气压下或超大气压下进行。用于这种液相反应所需的催化剂被选择为至少一个或多个非均相酸催化剂,它们的烷基酯或酸酐。