Rhone Poulenc Agriculture Limited

Rhone-poulenc, Inc.

Philip H Smith

Simon Neil Pettit

Susan Mary Cramp

Tibor Musil

David William Hawkins

Scot Kevin Huber

Jamin Huang

Paul A Cain

Claude Lambert

Richard Henry Hewett

Christopher John Pearson

Derek Ian Wallis

Gillian Mary Little

John Morris

Thomas David Yarwood

John Harry Wilkinson

Neil Geach

Nicolas White

Herbicides derived from 2-cyano-1,3-diones have the formula: ##STR1## wherein R, R.sup.1, R.sup.2 R.sup.3, R.sup.4 and R.sup.5 are as defined in the description. The compounds are intended for use pre- and post-emergence as selective herbicides in maize and a large number of other monocotyledon crops.

Herbicidal 2-cyano-1,3-diones

Process for preparing complex pesticidal 1-(haloaryl)heterocyclic compounds by reacting 1-(nitroaryl)heterocycles with metallic halide salts.

Process for the preparation of pesticidal 1-(haloaryl) heterocyclic

The invention relates to isoxazole derivatives of formula (I): ##STR1## wherein: Ar represents phenyl optionally substituted by from one to three groups and wherein two substituents on adjacent positions of the phenyl ring, together with the two atoms to which they are attached, form a 5- to 7-membered ring which is optionally substituted;

Herbicidal isoxazoles

4-heteroaroylisoxazole derivatives of formula I: ##STR1## wherein: Ar represents an optionally substituted group Het, wherein Het represents a first heterocyclic ring containing from one to four heteroatoms in the ring selected from oxygen, nitrogen and sulphur, which is optionally fused with a benzene, or carbocyclic or second heterocyclic ring (which is optionally saturated or partially saturated) to form a bicyclic system, wherein the first heterocyclic ring of the group Het is attached to the carbonyl group in the 4-position of the isoxazole ring;

Herbicidal 4-heteroaroylisoxazole derivatives

Pyrido[2,3-d]pyridazin-5-one and pyrido[2,3-d]pyridazin-5-thione derivatives of general formula (I): ##STR1## wherein R and R.sup.1 independently represent hydrogen, optionally halogenated alkyl, alkenyl or alkynyl, optionally substituted heterocycle or a group --[CR.sup.41 R.sup.42 ].sub.n -(phenyl)-(R.sup.3).sub.q ;

Herbicidal pyridopyridazinones and pyridopyridazinethiones

The invention relates to nicotinic acid hydrazone derivatives of formula I: ##STR1## in which the various symbols are as defined in the description, and their use as herbicides or as intermediates in the synthesis of herbicides.

Nicotinic acid hydrazone compounds which have useful herbicidal

The invention relates to 4-benzoylisoxazole derivatives of formula (I): ##STR1## wherein R represents hydrogen or --CO.sub.2 R.sup.4 ; R.sup.1 represents alkyl, haloalkyl or optionally substituted cycloalkyl;

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Essex, United Kingdom

Philip H Smith