- Practical synthesis of S-alkyl thiocarbamate herbicides by carbonylation of amines with carbon monoxide and sulfur
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An industrial and economic carbonylation of amines with carbon monoxide and sulfur has been developed for the synthesis of S-alkyl thiocarbamate herbicides. In the presence of potassium carbonate and solvent DMSO, S-alkyl thiocarbamates, such as thiobencarb and orbencarb (herbicides) are synthesized in excellent yields from amines, carbon monoxide, sulfur, and alkyl halides under mild conditions (1atm, 20°C).
- Mizuno, Takumi,Iwai, Toshiyuki,Ito, Takatoshi
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p. 2869 - 2873
(2007/10/03)
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- Soluble polymer based matrix for chemically active water insoluble components
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This invention relates to a water soluble matrix composition comprising an anionic surfactant, a C6 to C18 alkyl pyrrolidone, urea and a water insoluble copolymer of vinyl pyrrolidone with not more than 50 wt. % of a comonomer selected from the group of an α-olefin, vinyl acetate, an acrylic or methacrylic acid ester and methacrylamide as a free flowing particulate solid which matrix is suitably mixed with a water insoluble, chemically active component, such as an agrochemical, to provide a clear sprayable film forming emulsion, such as a non-leachable film on a plant or other substrate surface. The invention also relates to the method of preparing the matrix and to the incorporation of an agrochemical concentrate and plant spray composition.
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- Furanyl oximes
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Novel oxime ethers and oxime esters of the formula I given herein have various advantageous effects with regard to stimulation of plant growth, particularly in the early stage of development of the plant. Furthermore, such compounds have the property of rendering, in the sense of an antidote action, agricultural chemicals which would otherwise damage the plants (phytotoxic chemicals) more compatible with the cultivated plants. Herbicides that are insufficiently selective can be used for example in the presence of such oxime derivatives in specific cultivated crops for combating weeds, without disadvantageous consequences for the cultivated plants.
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- Phenylglyoxylonitrile-2-oxime-cyanomethyl ether as plant growth regulator
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Phenylglyoxylonitrile-2-oxime-cyanomethyl ether of the formula STR1 and compositions containing it, have various advantageous effects with regard to regulation of plant growth. Furthermore, this compound and its compositions have the property of rendering, in the sense of an antidote (safening) action, agricultural chemicals which would otherwise damage the plants more compatible with cultivated plants. Strong herbicides, for example chloroacetanilides or thiolcarbamates, can be used in the presence of such safening agents in specific crops such as sorghum and rice for combatting weeds without disadvantageous consequences for the crops. The safeners are preferably applied to the crop seeds prior to planting.
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- Process for the preparation of substituted S-alkyl thio-carbamates
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The invention relates to a new and advantageous process for the preparation of substituted S-alkyl thiocarbamates having the general formula (I), EQU1 wherein R1 stands for a C1-4 alkyl group, R2 stands for a C1-4 alkyl or cyclohexyl group, or R1 and R2 may form together a C4-6 polymethylene group, and R3 stands for a C2-3 alkyl group. In accordance with the invention the substituted O-alkyl thiocarbamates of the general formula (II), EQU2 wherein R1, R2 and R3 each have the same meanings as defined above, are subjected to isomerization by heating them at a temperature of 130° to 180°C in the presence of dimethyl sulfate or diethyl sulfate to yield the appropriate S-alkyl esters.
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