A process for the preparation of a 4,6-dihalogeno-triazine of the formula ##STR1## wherein R represents an aryl or aryloxy radical or 5 or 6-membered nitrogen-containing aromatic heterocyclic radical which can be optionally mono or polysubstituted by a C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogeno, nitro, cyano, C.sub.1 -C.sub.4 -carbalkoxy, aryl or aryloxy and Hal.sup.1 denotes a halogen atom is described wherein a trihalogenomethyl compound of the formula R--C (Hal.sup.2).sub.3 wherein R has the meaning indicated above and Hal.sup.2 represents a halogen atom is reacted with Hal.sup.1 --CN in which Hal.sup.1 has the meaning indicated above at a temperature of 50.degree. to 200.degree. C. in the presence of a Lewis acid. Optionally the process can be conducted in the presence of an inert solvent.
一种制备4,6-二卤代三嗪的方法,其
化学式为##STR1##其中R代表芳基或芳氧基基团或5或6-成员的氮含杂环芳基基团,可以选择性地通过C.sub.1-C.sub.4-烷基,C.sub.1-C.sub.4-氧烷基,卤素,硝基,
氰基,C.sub.1-C.sub.4-羰基烷基,芳基或芳氧基单取代或多取代,Hal.sup.1代表卤素原子,其中描述了一种三卤代甲基化合物的方法,其
化学式为R--C (Hal.sup.2).sub.3,其中R具有上述所指的含义,Hal.sup.2代表卤素原子,与Hal.sup.1--CN反应,其中Hal.sup.1具有上述所指的含义,在50℃至200℃的温度下,在Lewis酸的存在下进行。可选择性地在惰性溶剂存在下进行该方法。