申请人:Ciba-Geigy Corporation
公开号:US04032503A1
公开(公告)日:1977-06-28
Process for the manufacture of styrene compounds of the formula ##STR1## wherein A denotes one of the ring systems ##STR2## and wherein R.sub.1 denotes hydrogen, alkyl with 1 to 8 carbon atoms, cyclohexyl, phenylalkyl with 1 to 3 carbon atoms in the alkyl part, phenyl, alkoxy with 1 to 4 carbon atoms, or chlorine, or, conjointly with R.sub.2, denotes alkylene with 3 or 4 carbon atoms, R.sub.2 denotes hydrogen or alkyl with 1 to 4 carbon atoms or, conjointly with R.sub.1, denotes alkylene with 3 or 4 carbon atoms, R.sub.3 denotes hydrogen or methyl, R.sub.4 denotes hydrogen, m-methyl, alkyl with 2 to 8 carbon atoms, phenyl, alkoxy with 1 to 4 carbon atoms, or chlorine, or, conjointly with R.sub.5, denotes a fused benzene ring, R.sub.5 denotes hydrogen or chlorine or, conjointly with R.sub.4, denotes a fused benzene ring, X.sub.1 denotes hydrogen, alkyl with 2 to 4 carbon atoms, alkoxy with 1 to 4 carbon atoms or chlorine, X.sub.2 denotes hydrogen or chlorine, Y denotes hydrogen, chlorine, alkyl with 1 to 4 carbon atoms or phenyl and Z denotes hydrogen or chlorine, which is characterized in that a methyl compound of the formula ##STR3## is reacted with a Schiff's base of the formula ##STR4## wherein Ar denotes an aromatic radical, in dimethylformamide in the presence of a strongly basic alkali metal compound, the reaction mixture being irradiated, at least initially, with UV light.
制造化合物的工艺过程式为:##STR1## 其中,A表示环系之一:##STR2## R.sub.1表示氢、1-8个碳原子的烷基、环己基、烷基部分含有1-3个碳原子的苯基烷基、苯基、1-4个碳原子的烷氧基或氯,或与R.sub.2共同表示3或4个碳原子的烷基,R.sub.2表示氢或1-4个碳原子的烷基,或者与R.sub.1共同表示3或4个碳原子的烷基,R.sub.3表示氢或甲基,R.sub.4表示氢、间甲基、2-8个碳原子的烷基、苯基、1-4个碳原子的烷氧基或氯,或与R.sub.5共同表示一个融合的苯环,R.sub.5表示氢或氯,或者与R.sub.4共同表示一个融合的苯环,X.sub.1表示氢、2-4个碳原子的烷基、1-4个碳原子的烷氧基或氯,X.sub.2表示氢或氯,Y表示氢、氯、1-4个碳原子的烷基或苯基,Z表示氢或氯。其特征在于,在强碱金属化合物存在下,在二甲基甲酰胺中,将式为##STR3##的甲基化合物与式为##STR4##的席夫碱反应,反应混合物至少在最初时用紫外线照射。