Basf Aktiengesellschaft

Basf Corporation

Hanspeter Hansen

Wolfgang Rohr

Bruno Wuerzer

Hans Rupert Merkle

Karl Eicken

Adolf Fischer

Adolf Fischer, Deceased

Peter Plath

Bernhard Zipperer

Erich Fretschner

Gerhard Hamprecht

Hans Theobald

Wolfgang Ladner

Karl-Friedrich Jager

Albrecht Mueller

Joseph F Louvar

Mao-Yao Huang

Kurt Fett

Alfons Durein

Albrecht M&uuml;ller

Otto W&ouml;rz

Hansjorg Rettenmaier

Heinz-Guenter Ceser

Albrecht Muller

Kurt Benz

A process for preparing 3-isopropyl-1H-2,1,3-benzothiadiazin-4 (3H)-one 2,2-dioxide (I) or a salt of I

Method for the production of 3-isopropyl-1H-2, 1,3-benzothiadiazine-4 (3H)-one-2,2-dioxide

Preparation of ammonium salts of 3-isopropyl-2, 1,

Preparation of optically active 2-halopropionic acids

Process for the preparation of (L)-2-chloropropionic acid and its salts

The instant invention relates to a process and apparatus for treating wastewater containing bentazon by decomposing the bentazon therein and thus eliminating or substantially reducing the bentazon content. This process comprises adjusting the pH of the wastewater to a value of less than 7 and heating it to a temperature of at least about 60.degree. C.

Bentazon containing wastewater treatment

Novel dichloroacetamides of the formula (I) ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, m, n, p and q have the meanings given in the description. The compounds are antagonists which increase the toleration, by crops, of herbicidal acetanilides. Herbicides containing the dichloroacetamides of the formula I in combination with acetanilides may be used for controlling undesired plant growth in Indian corn and cereals.

Dichloroacetamides, herbicides containing acetanilides as herbicidal

3-Isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide (bentazone) is isolated from waste water, originating from its preparation and working up, by treating the waste water with an acid to bring the pH initially to 7.5-9.5, adding 0.2-0.5% by volume, based on the waste water, of a 40-60 percent strength by weight aqueous bentazone salt solution and heating the mixture for 15-30 minutes at 75.degree.-110.degree. C. The solution thus treated is then cooled and brought to pH 1-3 with a mineral acid, whereupon the bentazone precipitates in a form which can be filtered off.

Isolation of 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide from

Substituted pyridazone derivatives having a good herbicidal action, herbicides containing these compounds as active ingredients, and a process for controlling the growth of unwanted plants with these compounds.

1-Substituted phenyl-pyridazone herbicides

A herbicidal mixture containing a herbicidal substituted anilide and substituted dichloroacetamide as antidote therefor, is disclosed.

Herbicidal agents based on acetanilides and dichloroacetamides

Herbicidal agents containing at least one substituted anilide of the formula ##STR1## where R denotes hydrogen, linear or branched alkyl or alkoxy of up to 5 carbon atoms, R.sup.1 denotes hydrogen, halogen, or linear or branched alkyl or alkoxy of up to 5 carbon atoms, R.sup.2 denotes hydrogen, halogen, or linear or branched alkyl or alkoxy of up to 5 carbon atoms, R together with R.sup.2 denotes an alkylene chain of up to 6 carbon atoms which is linked in the o-position and may be substituted by linear or branched alkyl of up to 4 carbon atoms, X denotes chlorine or bromine, and A denotes azole which is attached via a ring nitrogen atom and may be mono- or polysubstituted by halogen, phenyl, alkyl, alkoxy, alkylthio or perfluoroalkyl, each of up to 4 carbon atoms, cyano, carboxy, carbalkoxy of up to 4 carbon atoms in the alkoxy, or alkanoyl of up to 4 carbon atoms, or A denotes a salt of an azole containing 2 or 3 nitrogen atoms, as herbicidal active ingredient, and N-dichloroacetyl-2,2-dimethyl-1,3-oxazolidine as antagonistic agent. The ratio of acetanilide to N-dichloroacetyl-2,2-dimethyl-1,3-oxazolidine is, whether they are applied separately or together, from 1:2 to 1:0.01 parts by weight.

Herbicidal agents

Herbicidal agents containing ethyl-N-ethyl-N-bicyclo-[2.2.1]-hept-2-yl-thiolcarbamate of the formula ##STR1## as herbicidal active ingredient and at least one haloacylamide of the formula ##STR2## where R denotes linear or branched haloalkyl of a maximum of 3 carbon atoms, and R.sup.1 and R.sup.2 are identical or different and each denotes linear or branched alkyl of a maximum of 6 carbon atoms which is unsubstituted or substituted by alkoxy of a maximum of 4 carbon atoms or by cyano, R.sup.1 and R.sup.2 further denote cycloalkyl of 3 to 6 carbon atoms, or linear or branched alkenyl or alkynyl of a maximum of 4 carbon atoms, or R.sup.1 and R.sup.2, together with the nitrogen atom whose substituents they are, form a 4- to 9-membered, saturated monocyclic or bicyclic ring which is unsubstituted or mono- or polysubstituted by linear or branched alkyl of a maximum of 4 carbon atoms, or a tetrahydro-1,3-oxazine ring of the formula ##STR3## where R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are identical or different and each denotes hydrogen or linear or branched alkyl of a maximum of 3 carbon atoms, R.sup.8 denotes hydrogen or linear or branched alkyl of a maximum of 8 carbon atoms, R.sup.9 denotes hydrogen, linear or branched alkyl of a maximum of 8 carbon atoms, alkoxyalkyl of a maximum of 6 carbon atoms or dialkoxyalkyl of a maximum of 8 carbon atoms, or R.sup.8 and R.sup.9 may together form a methylene chain of 4 or 5 carbon atoms, as antagonistic agent. The weight ratio of ethyl-N-ethyl-N-bicyclo-[2.2.1]-hept-2-yl-thiolcarbamate to antagonistic agent is, whether applied together or separately, from 1:1 to 1:0.01.

Herbicidal agents containing a thiolcarbamate

New and valuable O-aminosulfonylglycolic anilides, a process for their manufacture, herbicides containing these compounds as active ingredients and a process for controlling the growth of unwanted plants with these compounds.

O-Aminosulfonylglycolic anilides

Isoxazolylmethylthiol carbamates, herbicides containing these compounds, and methods of controlling the growth of unwanted plants with these compounds.

Isoxazolylmethylthiol carbamates

1-Polyfluoroalkoxyphenyl-4-substituted-5-halopyridazones-6 in which the 4-substituent is amino, monoalkylamino, dialkylamino (1 to 3 carbon atoms per alkyl) or lower alkoxy, chloroacetamido, CH.sub.3 COOCH.sub.2 --CO--NH-- or trimethylenimino and herbicidal uses thereof to control growth of unwanted plants among crop plants, especially cotton.

Growing community of inventors

Ludwigshafen, Germany

Hanspeter Hansen