N,N-di:substd. di:chloro:acetamide herbicide antidotes prepn. - by reacting chloral and sec. amine in aq. or polar organic medium in presence of e.g. a cyanide

Prepn. of dichloroacetamide derivs. of formula CHCl2-CO-NR1R2 (I) (where R1 is 1-6C alkyl, 2-5C alkenyl or a benzenoid gp., R2 is 1-6C alkyl or 2-5C alkenyl; or NR1R2 is morpholino) comprises reacting an amine NHR1R2 (II) with CCl3-CHO or its oxo addn. derivs. Reaction is in an aq. or polar organic...

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Bibliographische Detailangaben
1. Verfasser:	DOCTEUR ATTILA KIS-TAMAS, LASZLO MAJOROS, FERENC JURAK, GABOR FRIED, DOCTEUR ISTVAN ORBAN, JOZSEF HALMOS, GYORGY MIHALYI, LASZLO GORA ET ISTVAN KOVACS
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AGRICULTURE ANIMAL HUSBANDRY BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES CHEMISTRY FISHING FORESTRY HETEROCYCLIC COMPOUNDS HUMAN NECESSITIES HUNTING METALLURGY ORGANIC CHEMISTRY PEST REPELLANTS OR ATTRACTANTS PLANT GROWTH REGULATORS PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF TRAPPING
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Beschreibung
Zusammenfassung:	Prepn. of dichloroacetamide derivs. of formula CHCl2-CO-NR1R2 (I) (where R1 is 1-6C alkyl, 2-5C alkenyl or a benzenoid gp., R2 is 1-6C alkyl or 2-5C alkenyl; or NR1R2 is morpholino) comprises reacting an amine NHR1R2 (II) with CCl3-CHO or its oxo addn. derivs. Reaction is in an aq. or polar organic medium, in presence of an alkaline acid binder and/or a mineral or organic cyanide source, pref. a cyanide. Pref. excess (II), NaHCO3 or CaO is used as acid binder. Reaction temp. is pref. -20 to +120 degrees C. (I) are herbicide antidotes. They may be applied pre- or post- emergence to plants or to seeds to prevent damage by herbicides. They are pref. applied separately from the herbicide. (II) are acylated in high yield without using CHCl2COCl, which is highly corrosive and difficult to obtain in pure form. CCl3CHO is stable and readily available. Almost quantitative yields can be obtd. in a few hrs. at room temp. Préparation de dichloracétamides secondaires de formule :