19937-59-8Relevant articles and documents
Synthesis method of phenylurea herbicide or deuteration-labeled phenylurea herbicide
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Paragraph 0120; 0121; 0122, (2017/02/17)
The invention relates to a synthesis method of a phenylurea herbicide or a deuteration-labeled phenylurea herbicide (a compound of a formula (I)). The compound of the formula (I) is obtained by reacting a compound of a formula (II) with a dimethylamine salt or D6-dimethylamine salt in the presence of an organic base. According to the synthesis method, the side reaction of substituted phenyl isocyanate and water or alcohol is avoided, the leakage of dimethylamine or dimethylamine-D6 is reduced, and the synthesis method has the advantages of simple operation, low requirements for equipment, low cost, high yield, and fewer by-products. The formula I is shown in the description.
Phenylureas. Part 1. Mechanism of the basic hydrolysis of phenylureas
Laudien,Mitzner
, p. 2226 - 2229 (2007/10/03)
The mechanism of the hydrolytic decomposition of phenylureas in basic media in the pH range 12 to 14 is investigated. In this pH range a levelling of the rate-pH curve is observed as well as a change of the substituent influence on the hydrolysis rate. These experimental findings suggest the formation of an unreactive side product of the phenylurea in a parasitic side equilibrium at sufficiently high pH. The urea dissociates at the aryl-NH group to give its conjugate base. For the hydrolytic decomposition of phenylureas an addition-elimination mechanism is proposed as has been established for the alkaline hydrolysis of carboxylic acid esters and amides.
Biocide composition and use
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, (2008/06/13)
A stable liquid dispersion in an non-polar organic solvent containing an alkylsulphonylhalopyridine and a dispersing agent which is the reaction product of a hydroxyalkylcarboxylic acid and an amine or salt thereof. The alkylsulphonylhalopyridine may be 2,3,5,6-tetrachloro-4-(methylsulphenyl)pyridine and the hydroxycarboxylic acid may be poly(12-hydroxystearic acid) and the amine may be either dimethylamino propylamine or polyethyleneimine. The solvent may be white spirit or an ester or vegetable oil which is a plasticiser for PVC.