申请人:Petrolite Corporation
公开号:US04146714A1
公开(公告)日:1979-03-27
A process of converting 2,3,4,5-tetrahydropyrimidines (.DELTA.-1) having at least one hydrogen in the 2-position to 3,4,5,6-tetrahydropyrimidines (.DELTA.-2), which comprises hydrogenating and dehydrogenating said .DELTA.-1 tetrahydropyrimidines. Such hydrogenating and dehydrogenating may be done in either two sequential steps or in one step. Said .DELTA.-1 tetrahydropyrimidines can also be converted to .DELTA.-2 tetrahydropyrimidines by heating in the essential absence of a solvent, and preferably under basic conditions. In addition, corresponding hexahydropyrimidines can be converted to corresponding .DELTA.-2 tetrahydropyrimidines by dehydrogenation. This invention also relates to the use of .DELTA.-2 tetrahydropyrimidines, particularly as corrosion inhibitors.
将至少在2位具有一个氢原子的2,3,4,5-四氢嘧啶(Δ-1)转化为3,4,5,6-四氢嘧啶(Δ-2)的过程,包括对所述Δ-1四氢嘧啶进行氢化和脱氢。这种氢化和脱氢可以通过两个连续步骤或一个步骤来完成。所述Δ-1四氢嘧啶也可以通过在基本无溶剂存在的情况下加热,最好在碱性条件下进行,转化为Δ-2四氢嘧啶。此外,相应的六氢嘧啶可以通过脱氢转化为相应的Δ-2四氢嘧啶。本发明还涉及使用Δ-2四氢嘧啶,特别是作为缓蚀剂。