BENZENESULFONAMIDE DERIVATIVES AS HERBICIDES

A compound having structural formula (I), wherein R is hydrogen, C1?-C4? alkyl, C1?-C4? haloalkyl, formyl, C2?-C6? alkanoyl, C3?-C4? alkenyl or C3?-C4? alkynyl, or alkali metal; X is C1?-C4? alkyl, C1?-C8? alkoxy, cyano, or halogen; Y is hydrogen, halogen, or C1?-C4? dialkylamino; R?1 is hydrogen, C1?-C8? straight chain or branched alkyl, C3?-C8? cycloalkyl, C3?-C8? alkenyl, C3?-C8? alkoxy or C3?-C8? hydroxyalkyl; R?2 is hydrogen, C1?-C8? straight chain or branched alkyl, C3?-C8? alkenyl, C3?-C8? cycloalkyl, halo substituted C3?-C8? alkenyl, C3?-C8? alkynyl, C1?-C4? alkoxy, hydroxy C1?-C4? alkyl, cyano C1?-C4? alkyl, 2,3-epoxypropyl, 2,2-dialkoxyethyl, alkoxyalkyl, phenyl, aralkyl, C1?-C4? acyl, C1?-C4? carbalkoxyalkyl, C1?-C4? carbalkoxyalkyl substituted by C1?-C4? alkyl, phenylmethyl or methylthioethyl, (1,3-dioxolan-2-yl)alkyl, dialkylaminoethyl, or tetrahydrofuranylmethyl; R?3 is hydrogen, halogen or C1?-C4? alkyl; R?4 is C1?-C4? alkyl or C1?-C4? haloalkyl; R?1 and R?2 taken together form a C3?-C8? membered heterocyclic ring containing one or more heteroatoms. In addition, processes and novel intermediate compounds that are useful for making the compound are set forth. A method for controlling weeds which comprises applying a herbicidally effective amount of the compound recited above is described. Also disclosed is a composition useful as a herbicide which includes a compound of this invention and a suitable carrier therefor. Composé de la formule structurelle (I) dans laquelle R est hydrogène, alkyle C1-C4, haloalkyle C1-C4, formyle, alkanoyl, alcényle C3-C4 ou alcynyle C3-C4, ou un métal alcalin; X est alkyle C1-C4, alcoxy C1-C8, cyano ou halogène; Y est hydrogène, halogène ou dialkylamino C1-C4; R1 est hydrogène, alkyle ramifié ou à chaîne linéaire C1-C8, cycloalkyle C3-C8, alcényle C3-C8, alcoxy C3-C8 ou hydroxyalkyle C3-C8; R2 est hydrogène, alkyle ramifié ou à chaîne linéaire C1-C8, alcényle C3-C8, cycloalkyle C3-C8, alcényle C3-C8 à substitution halo, alcynyle C3-C8, alcoxy C1-C4, alkyle C1-C4 d'hydroxy, alkyle C1-C4 de cyano, 2,3-époxypropyle, 2,2-dialcoxyéthyle, alcoxyalkyle, phényle, aralkyle, acyle C1-C4, carbalcoxyalkyle C1-C4, carbalcoxyalkyle C1-C4 substitué par alkyle C1-C4, phénylméthyle ou méthylthioéthyle, (1,3-dioxolan-2-yle) alkyle, dialkylaminoéthyle ou tétrahydrofuranylméthyle, R3 est hydrogène, halogène ou alkyle C1-C4; R4 est alkyle C1-C4 ou haloalkyle C1-C4; R1 et R2 pris ensemble forment un anneau hétérocyclique à éléments C3