摘要:
5-Alkoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfonamides are prepared from 5-alkoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfonyl halides by condensation with ortho-substituted N-trialkylsilylanilines and by other methods. N-(2,6-dichloro-3-methylphenyl)-8-fluoro-5-methoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfonamide is typical. The compounds are general and selective pre- and postemergence herbicides.
摘要:
Novel substituted imidazolo[1,2-a]pyrimidine-2-sulfonanilides are prepared from novel substituted imidazolo[1,2-a]pyrimidine-2-sulfonic acids by conversion to the corresponding sulfonyl halides and condensation with substituted anilines and by other methods. N-(2,6-difluorophenyl)-3-chloro-4,6-dimethylimidazolo[1,2-a]pyrimidine-2-sulfonamide is typical of the compounds prepared. The compounds are useful general and selective pre- and post-emergence herbicides.
摘要:
Sulfonamides derived from substituted 2-amino-1,2,4-triazolo[1,5-a]pyrimidines are prepared by reacting a desired sulfonamide with dimethyl N-cyanodithioiminocarbonate in the presence of a base followed by reaction with an excess of hydrazine and then a 1,3-dicarbonyl compound.The resulting products have a variety of herbicidal uses.
摘要:
Sulfonamides derived from substituted 2-amino-1,2,4-triazolo[1,5-a]pyrimidines are prepared by reacting a desired sulfonamide with dimethyl N-cyanodithioiminocarbonate in the presence of a base followed by reaction with an excess of hydrazine and then a 1,3-dicarbonyl compound.The resulting products have a variety of herbicidal uses.
摘要:
Process for making optically active esters having an enhanced optical purity by reacting a mole of an appropriate substrate phenol with a molar excess of an appropriate optically active ester.
摘要:
Novel substituted pyrazolo[1,5-a]pyrimidine-2-sulfonamide compounds, such as 3-cyano-5,7-dimethyl-N-2,6-dichlorophenylpyrazolo[1,5-a]pyrimidine-2-sulfonamide, were prepared by the condensation of novel substituted 2-benzylthiopyrazolo[1,5-a]pyrimidine compounds, such as 2-benzylthio-5,7-dimethylpyrazolo[1,5-a]pyrimidine, and substituted anilines and found to be useful as herbicides.
摘要:
N-(Substituted-phenyl)-5-fluoromethyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamides are prepared from 2-benzylthio-5-fluoromethyl-1,2,4-triazolo[1,5-a]-pyrimidines and found to be herbicidal. The compounds, illustrated by 5-fluoromethyl-7-methoxy-(2,6-dichloro-3-methylphenyl)-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamide, are degradable in the soil.
摘要:
N-(Substituted-phenyl)-5-fluoromethyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamides are prepared from 2-benzylthio-5-fluoromethyl-1,2,4-traizolo[1,5-a]pyrimidines and found to to be herbicidal. The compounds, illustrated by 5-fluoromethyl-7-methoxy-(2,6-dichloro-3-methylphenyl)-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamide, are degradable in the soil.
摘要:
Novel compounds, e.g., N-(5,7-dimethyl-1,2,4-triazolo [1,5-a]pyrimidin-2-yl)-2-thiophene sulfonamide and their compositions and use in the control of weeds.
摘要:
A process has been discovered for selective preparation of isomers and enantiomers of 2,2-dimethyl-3-(2,2-dihalovinyl)cyclopropane carboxylic acids. In this process an adduct of an alkyl 3,3-dimethyl-4-pentenoate and a substituted 2-oxazolidone is reacted with a substituted dihalomethane compound. The resulting compound is cyclized, dehydrohalogenated and hydrolyzed to yield the desired product. These cyclopropane carboxylic acids are useful precursors for pyrethroid insecticides.