- Synthesis method of cartap
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The invention provides a synthesis method of cartap, and relates to a synthesis method of 1,3-bis(carbamyl sulfonium)-2-(N,N-dimethylamino) propane hydrochloride. An original medicine of cartap is prepared from carbon oxysulfide, ammonia and 1-(N,N-dimethylamino)-2,3-propylene dichloride (chloride for short) through a one-pot method in an alkaline solution. By the adoption of the one-pot method for reaction step by step to prepare the cartap, the synthesis method has the advantages of low equipment investment, low energy consumption, easiness and convenience for operation and substantial improvement of the conversion rate. According to the synthesis method, the use of organic raw materials such as sodium thiosulfate (sodium thiosulfate) and sodium cyanide is avoided, so that generation of a large amount of sewage containing sodium sulfite and sodium cyanide is avoided. The synthesis method substantially increases the selectivity and the conversion rate in a reaction process, thus improving the production efficiency and greatly reducing the production cost.
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Paragraph 0029-0041
(2017/07/21)
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- Nitro- and cyanoguanidines as selective preemergence herbicides and plant defoliants
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There are provided novel nitroguanidine and cyanoguanidine compounds. A method of dessicating and defoliating plants by applying to the foliage thereof certain nitroguanidine or cyanoguanidine compounds and a method for the selective preemergence control of undesirable broadleaf weeds and grasses in the presence of graminaceous crops are disclosed.
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