申请人:Bayer Aktiengesellschaft
公开号:US03997552A1
公开(公告)日:1976-12-14
Imidazole derivatives, useful as intermediates for making herbicides, having the formula ##STR1## wherein X is chlorine, lower alkyl mono- or polysubstituted by chlorine, or aryl which is optionally mono- or polysubstituted by halogen and/or lower alkyl and R.sub.1 and R.sub.2 are identical or different and are chlorine or phenyl optionally substituted by halogen and/or lower alkyl. The imidazole derivatives are prepared by converting an imidazole derivative having the formula ##STR2## wherein X' is hydrogen, lower alkyl or aryl optionally substituted by halogen atom and/or lower alkyl and R'.sub.1 and R'.sub.2 are identical and represent hydrogen and/or phenyl optionally substituted by halogen and/or lower alkyl By means of hydrogen chloride, in the absence of water, into the corresponding hydrochloride, subsequently reacting with hydrochloride with an excess of chlorine at elevated temperature.
咪唑衍生物具有以下公式:##STR1## 其中X为氯,由氯单取代或多取代的较低烷基,或者是芳基,可选地单取代或多取代卤素和/或较低烷基,而R.sub.1和R.sub.2相同或不同,是氯或苯,可选地取代卤素和/或较低烷基。这些咪唑衍生物是制备除草剂的中间体,通过将具有以下公式的咪唑衍生物转化而来:##STR2## 其中X'为氢、较低烷基或可选地取代卤素原子和/或较低烷基的芳基,而R'.sub.1和R'.sub.2相同且表示氢和/或可选地取代卤素和/或较低烷基的苯基,通过氢氯酸的作用,在无水的情况下转化为相应的盐酸盐,随后在高温下用过量的氯反应。