- 1-methyl-1-methoxy-3-phenylurea synthetic method
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The invention discloses a synthesis method of 1-methyl-1-methoxyl-3-phenylurea. The synthesis method comprises the following steps of carrying out gasification reaction of phenylamine and light in an organic solvent to obtain phenyl isocyanate; reacting an organic solvent solution of phenyl isocyanate with hydroxylamine sulphate in an alkaline aqueous solution in the presence of a catalyst A to obtain 1-hydroxyl-3-phenylurea; reacting 1-hydroxyl-3-phenylurea with dimethyl sulphate in the alkaline condition in the presence of a catalyst B to obtain 1-methyl-1-methoxyl-3-phenylurea. The synthesis method of 1-methyl-1-methoxyl-3-phenylurea has the advantages of being simple and direct in process, high in product purity, easy in control of production processes, and the like.
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Paragraph 0015; 0016; 0026; 0032; 0033; 0040; 0041
(2016/10/07)
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- Investigating N-methoxy-N′-aryl ureas in oxidative C-H olefination reactions: An unexpected oxidation behaviour
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Herein, we report a urea derived directing group for mild and highly selective oxidative C-H bond olefination. Subsequent intramolecular Michael addition affords dihydroquinazolinones in good yields. The N-O bond of the urea substrate exhibits superior oxidative behaviour compared to a variety of other external oxidants. The Royal Society of Chemistry 2011.
- Willwacher, Jens,Rakshit, Souvik,Glorius, Frank
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supporting information; experimental part
p. 4736 - 4740
(2011/08/06)
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- Photochemical transformation of aqueous para-halogenophenylureas: Evidence for the intermediary formation of carbenes
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N-Substituted 4-iminocyclohexa-2,5-dienylidenes (λ(max) = 300 and 405 nm) are detected at pulse end upon laser flash photolysis of aqueous monuron and metobromuron. In oxygenated medium these carbenes are converted into N-substituted iminoquinone-O-oxides
- Boukhram,Richard
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p. 849 - 851
(2007/10/03)
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- 5,6-Dihydro-1,2,4,6-thiatriazin-5-one-1,1-dioxides
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5,6-Dihydro-1,2,4,6-thiatriazin-5-one-1,1-dioxides of the formula STR1 where R1 is hydrogen, a metal atom or an unsubstituted or substituted ammonium radical, R2 is a saturated or unsaturated straight-chain aliphatic radical of up to 10 carbon atoms, a cycloaliphatic radical or 3 to 7 carbon atoms, a branched saturated or unsaturated aliphatic radical of 3 to 10 carbon atoms, a halogen-, alkoxy- or alkylmercapto-substituted aliphatic radical of 2 to 10 carbon atoms tetrahydrofuryl substituted methyl, a cycloalkoxy-substituted aliphatic radical of 4 to 10 carbon atoms, unsubstituted or halogen-substituted benzyl or phenyl, halophenyl, or alkylphenyl of a total of up to 10 carbon atoms, R3 is hydrogen, a straight-chain aliphatic radical of up to 10 carbon atoms, a cycloaliphatic radical of 3 to 7 carbon atoms, a branched aliphatic radical of 3 to 10 carbon atoms, haloalkyl, or alkoxyalkyl of 2 to 10 carbon atoms and X is oxygen and may also be sulfur if R2 is unsubstituted or halogen-substituted benzyl, processes for their preparation, and herbicides containing the above compounds.
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