申请人:Siemer Michael
公开号:US20100249432A1
公开(公告)日:2010-09-30
Process for preparing 1,3-disubstituted imidazolium salts of the formula I
where
R1 and R3 are each, independently of one another, an organic radical having from 1 to 20 carbon atoms,
R2, R4 and R5 are each, independently of one another, an H atom or an organic radical having from 1 to 20 carbon atoms,
X is the anion of a hydrogen acid having a pK
a
of at least 2 (measured at 25° C., 1 bar in water or dimethyl sulfoxide) and
n is 1, 2 or 3,
wherein
a) an α-dicarbonyl compound, an aldehyde, an amine and the hydrogen acid of the anion X
−
are reacted with one another and
b) the reaction is carried out in water, a solvent which is miscible with water or a mixture thereof.
制备1,3-二取代咪唑盐的公式I的过程,其中R1和R3分别独立地是具有1至20个碳原子的有机基团,R2、R4和R5分别独立地是一个氢原子或具有1至20个碳原子的有机基团,X是具有至少2的pKa(在25°C、1巴水或二甲基亚砜中测得)的氢酸根离子,n为1、2或3,其中a)α-二羰基化合物、醛、胺和阴离子X−的氢酸反应,b)反应在水、与水相溶的溶剂或二者的混合物中进行。