申请人:Richter Ingo
公开号:US20080228009A1
公开(公告)日:2008-09-18
Process for preparing 1,1,4,4-tetraalkoxybut-2-ene derivatives of the general formula (I),
where the radicals R
1
and R
2
are each, independently of one another, hydrogen, C
1
-C
6
-alkyl, C
6
-C
12
-aryl, such as phenyl, or C
5
-C
12
-cycloalkyl or R
1
and R
2
together with the double bond to which they are bound form a C
6
-C
12
-aryl radical, such as phenyl, a phenyl radical substituted by one or more C
1
-C
6
-alkyl groups, halogen atoms or alkoxy groups or a monounsaturated or polyunsaturated C
5
-C
12
-cycloalkyl radical, R
3
, R
4
are each, independently of one another, hydrogen, methyl, trifluoromethyl or nitrile, which comprises electrochemically oxidizing 1,4-dialkoxy-1,3-butadiene of the formula II
where the radicals R
1
, R
3
and R
4
have the same meanings as in the formula I, in the presence of a C
1
-C
6
-alkyl alcohol.
制备通式(I)中的1,1,4,4-四烷氧基丁-2-烯衍生物的过程,其中基团R1和R2各自独立地为氢、C1-C6烷基、C6-C12芳基(例如苯基)或C5-C12环烷基,或者基团R1和R2与它们所结合的双键共同形成C6-C12芳基基团(例如苯基),该苯基基团被一个或多个C1-C6烷基、卤素原子或烷氧基取代,或者是单不饱和或多不饱和的C5-C12环烷基基团,R3和R4各自独立地为氢、甲基、三氟甲基或腈基。该过程包括在C1-C6烷基醇的存在下,电化学氧化通式(II)中的1,4-二烷氧基-1,3-丁二烯,其中基团R1、R3和R4的含义与通式(I)中的相同。