C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/476.5, 260/4
C07C 69/736 (2006.01) C07C 121/75 (1985.01) C07C 149/40 (1985.01)
Patent
CA 1234139
ABSTRACT Compounds, and processes to prepare them, of the formula II Image (II) wherein R3 is C1-C4-alkoxy, C2-C6-alkenyloxy, C2-C4-alkynyloxy, C1-C4-haloalkoxy or C3-C5-alkoxyalkoxy, and X, Y and Z independ- ently of one another are each hydrogen, halogen, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkyl, C1-C4-haloalkoxy, -S(O)n-C1-C4- alkyl, -S(O)n-C1-C4-haloalkyl, where n is 0, 1 or 2, or they are each C(O)OR4, where R4 is hydrogen or C1-C4-alkyl, or they are each NO2, CN or NR5R6, where R5 and R6 independently of one another are each hydrogen, C1-C4-alkyl, C1-C4-alkylcarbonyl, C1-C4-haloalkylcarbonyl or C1-C4-haloalkylsulfonyl, with the proviso that, when the phenoxy group is in the p-position, R3 is C1-C4-alkoxy, and two of the substituents X, Y and Z are hydrogen, the third substituent is not hydrogen, fluorine, chlorine, bromine or trifluoromethyl are described. These compounds find use in the preparation of related dihydropyrones of the formula I Image in which R1 and R2 represent either C1-C4 alkyl groups or one is hydrogen, or together they form a C2-C6 alkylene bridge. These dihydropyrones can be used in combating weeds.
471811
Fory Werner
Tobler Hans
Fetherstonhaugh & Co.
Syngenta Participations Ag
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