摘要:
1,3,4-Thiadiazol-5-(4H)-onyl-(4)-methyl dithiophosphoric acid ester of the formula ##STR1## wherein each of R, R.sub.1 and R.sub.2 methyl or ethyl and Y represents oxygen or sulphur, are prepared by condensing a thiophosphate acid of the formula ##STR2## or an alkali metal or ammonium salt thereof, with a 1,3,4-thiadiazole of the formula ##STR3## with formaldehyde in an aqueous medium consisting essentially of 60-98 wt % of sulphuric acid, the amount of sulphuric acid is at least 0.7 mol per mol of free thiophosphoric acid, if free acid is used, and 1.7 mol per mol of thiophosphoric acid salt, if a salt is used. The temperature of the reaction mixture is maintained at 15.degree.-60.degree. C. The process is particularly useful in the preparation of O,O-dimethyl-S-[2-methoxy-1,3,4-thiadiazol-5(4H)-onyl-(4)-methyl]-dithiophosphate (methidathion).
摘要:
1,3,5-Triazapenta-1,4-dienes of the formula ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 represents hydrogen, halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, trifluoromethyl or cyano, and R.sub.4 represents C.sub.1 -C.sub.4 alkyl which is unsubstituted or substituted by halogen, a process for their manufacture and their use in pest control.
摘要:
1,2,4-Oxadiazoles, their manufacture and use as active ingredients in pesticides especially insecticides and acaricides. The compounds correspond to the formula ##STR1## wherein R.sub.1 represents hydrogen, unsubstituted alkyl, benzyl or phenyl, R.sub.2 represents methyl or ethyl, and R.sub.3 represents unsubstituted C.sub.1 -C.sub.7 alkyl optionally interrupted by oxygen or represents C.sub.3 -C.sub.4 alkenyl.
摘要:
1,3,5-Triazapenta-1,4-dienes of the formula ##STR1## wherein each of R.sub.1 to R.sub.6 represents hydrogen, halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, trifluoromethyl or cyano, a process for their manufacture and their use in pest control.
摘要:
Compounds of the formula ##EQU1## wherein R.sub.1 represents phenyl, or phenyl mono- to trisubstituted by halogen, mono- or disubstituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkylthio, nitro, cyano or trifluoromethyl, or monosubstituted by C.sub.1 -C.sub.4 -carbalkoxy,R.sub.2 represents methyl, methoxy, ethyl, ethoxy or phenyl,R.sub.3 represents hydrogen or methyl,R.sub.4 and R.sub.5 represent methyl, ethyl, n-propyl, isopropyl or allyl,X and Y represent oxygen or sulphur, orR.sub.4 and R.sub.5 with the nitrogen atom to which they are bound form the morpholino, piperidino or pyrrolidino ring, orR.sub.3 with R.sub.4 or R.sub.5 forms a 5- or 6-membered saturated ring, whereby then the group R.sub.4 or R.sub.5 not participating in the ring formation represents methyl or ethyl,A process for their manufacture and their use for the control of pests, especially for the control of phytopathogenic nematodes, are disclosed.
摘要:
Sulfonic acid esters of the formulaR.sub.1 -- SO.sub.2 -- O -- R.sub.2whereinR.sub.1 represents alkyl or alkenyl, andR.sub.2 represents an unsubstituted or substituted heteroaromatic five-membered ring having three hetero atoms, processes for their manufacture, and their use in pest control.