1,2,3-thiadiazolyl-ureas

Details 1,2,3-thiadiazolyl-ureas 1,2,3-thiadiazolyl-ureas

A - Human Necessities

01

N

71/8.2

A01N 25/00 (2006.01) C07D 285/06 (2006.01)

Patent

CA 1078202

ABSTRACT OF THE DISCLOSURE Living plants can be defoliated using a compound of the general formula I Image (I) in which R1 represents a hydrogen atom or a lower alkyl group; R2 represents a hydrogen atom or an alkyl group which may be interrupted by at least one hetero atom selected from oxygen and sulphur atoms; R3 represents an alkyl group which may be interrup- ted by at least one hetero atom selected from oxygen and sulphur atoms, a cycloaliphatic hydrocarbon group which may be substituted by at least one alkyl group, or an aromatic hydrocarbon group which may be substituted by at least one substituent selected from alkyl groups, halogen atoms, alkyl-mercapto groups, alkoxy groups, trifluoromethyl groups and a nitro group, or R2 and R3 together with the adjacent nitrogen atom represent a morpholino, piperidino or pyrrolidino group; and X represents an oxygen or sulphur atom. The compound of the general formula I is prepared, for example, by reacting a compound of the general formula Image in the presence of an acid-binding agent with a carbamoyl or thiocarbamoyl chloride of the general formula Image . in which R1, R2, R3 and X have the above meanings.

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