Bayer Aktiengesellschaft

Hans Holtschmidt

Gunther Beck

Helmut Heitzer

Fritz Doring

A process for preparing tetrachloropyrimidine comprising reacting 2-cyano-1,2-(dichlorovinyl)-isocyanide-dichloride of the formula

Process for the preparation of tetrachloropyrimidine

Perchlorodiazafulvene having the formula ##STR1## IS PREPARED BY REACTING 2,4,5-TRICHLORO-2-TRICHLOROMETHYL-2H-imidazole having the formula ##STR2## WITH DECHLORINATING AGENTS AT ELEVATED TEMPERATURES AND IS USEFUL AS A FUNGICIDE.

Perchlorodiazafulvene

Trichlorothiazole of the formula ##STR1## IS PREPARED BY REACTING 1,2,2,2-TETRACHLOROETHYL-ISOCYANIDEDICHLORIDE OF THE FORMULA ##STR2## WITH 1 TO 1.2 TIMES THE STOICHIOMETRIC AMOUNT OF SULFUR AT A TEMPERATURE OF ABOUT 150.degree. TO 250.degree. C, preferably about 170.degree. to 230.degree. C.

Preparation of trichlorothiazole and intermediate

2,5-Dichloro-thiazolo[4,5-d]thiazole, which is useful as a fungicide, is prepared by reacting compounds having the formula ##EQU1## wherein X.sub.1 is Cl, and

Growing community of inventors

Bergisch-Gladbach, Germany

Hans Holtschmidt