申请人:Lonza Ltd.
公开号:US03948969A1
公开(公告)日:1976-04-06
A process for preparing a 4-hydroxyphenyl-1,3-dioxo-2-indenylidene-acetonitrile. The process includes reacting 2-dicyanomethylene-1,3-indanione with a phenol having the formula: ##SPC1## Wherein R.sub.1 and R.sub.2 are the same or different and are each hydrogen, halogen, cyano, alkyl having one to four carbon atoms or alkoxy having one to four carbon atoms, at a temperature between 150.degree. and 250.degree.C. The reaction is preferably conducted in the presence of an organic solvent. A 4-hydroxyphenyl-1,4-dioxo-2-indenylidene-acetonitrile having the formula: ##SPC2## Wherein R.sub.1 and R.sub.2 are the same or different and are each hydrogen, halogen, cyano, alkyl having 1 to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms. Such compounds are useful as indicators.
一种制备4-羟基苯基-1,3-二氧代-2-茚基丙腈的方法。该方法包括将2-二氰基亚甲基-1,3-茚二酮与具有以下式的苯酚反应:## SPC1 ## 其中R1和R2相同或不同,且均为氢、卤素、氰基、具有1至4个碳原子的烷基或具有1至4个碳原子的烷氧基,在150℃至250℃的温度下进行反应。最好在有机溶剂的存在下进行反应。具有以下式的4-羟基苯基-1,4-二氧代-2-茚基丙腈:## SPC2 ## 其中R1和R2相同或不同,且均为氢、卤素、氰基、具有1至4个碳原子的烷基或具有1至4个碳原子的烷氧基。这种化合物可用作指示剂。