Basf Aktiengesellschaft

Walter Gueckel

Gotthard Synnatschke

Michael Keil

Hans Ziegler

August Wigger

Bjoern Girgensohn

Monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula ##STR1## which melts at 76.degree. C. Processes for its preparation and herbicides.

Preparation of monoclinic metazachlor

Monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula I ##STR1## which melts at 76.degree. C.

Monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-actanilide of the formula ##STR1## which melts at 76.degree. C. Processes for its preparation and herbicides.

Monoclinic metazachlor and composition

Herbicide based on 1-phenyl-4-amino-5-chloro (or 5-bromo-)-pyridazone-(6) in the form of an aqueous suspension containing from 20 to 50 wt % of active ingredient, and silica and a block copolymer of propylene glycol, propylene oxide and ethylene oxide.

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Limburgerhof, Germany

Walter Gueckel