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O-Alkyl-S-alkyl-O-[6-alkyl- or 6-halo-pyridazin-(3)-yl]-(thiono)thiol-phosphoric acid esters
| Details |
Inventors: Riebel, Hans-Jochem; Rohe, Lothar; Hammann, Ingeborg; Behrenz, Wolfgang;
Assignee: Bayer Aktiengesellschaft (Leverkusen, DT)
Primary Examiner: Gallagher; R. J.
Assistant Examiner: Tighe; Anne Marie T.
Attorney, Agent or Firm: Burgess, Dinklage & Sprung
O-alkyl-S-alkyl-O[6-alkyl- or 6-halo-pyridazin-(3)-yl]-(thiono)thiolphosphoric acid esters of the formula ##SPC1## In which R and R', which may be identical or different, are each alkyl with 1 to 4 carbon atoms, R" is alkyl with 1 to 3 carbon atoms or halogen, and X is oxygen or sulfur, Which possess insecticidal and acaricidal properties. |
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DETAILED DESCRIPTION We claim: 1.
An O-ethyl-S-n-propyl -O-(6-substituted-pyridazin(3)-yl)-thiono thiolphosphoric acid ester of the formula ##SPC6## in which R" is alkyl with 1 to 3 carbon atoms or halogen.
2.
The compound according to claim 1, wherein such compound is O-ethyl-S-n-propyl-O-[6-bromo-pyridazin(3)-yl]-thionothiolphosphoric acid ester of the formula ##SPC7## 3.
The compound according to claim 1, wherein such compound is O-ethyl-S-n-propyl-O-[6-methyl-pyridazin(3)-yl]-thionothiolphosphoric acid ester of the formula ##SPC8## 4.
The compound according to claim 1, wherein such compound is O-ethyl-S-n-propyl-O-[6-chloro-pyridazin(3)-yl]-thionothiolphosphoric acid ester of the formula ##SPC9##
Description:
The present invention relates to ahd has for its objects the provision of particular new O-alkyl-S-alkyl-O-[6-alkyl- or 6-halo-pyridazin-(3)-yl]-(thiono)thiolphosphoric acid esters which possess insecticidal and acaricidal properties, active compositions in the form of mixtures of such compounds with solid and liquid dispersible carrier vehicles, and methods for producing such compounds and for using such compounds in a new way especially for combating pests, e.
g.
insects and acarids, with other and further objects becoming apparent from a study of the within specification and accompanying examples.
It is known from U.
S.
Pat.
No.
2,759,938 and from German Published Specification DOS 1,950,491 that pyridazine-thionophosphoric acid esters, for example, O,O-diethyl-O-[6-chloro-(Compound A) and 6-methyl-pyridazin-(3)-yl]-thionophosphoric acid esters (Compound B), exhibit insecticidal and acaricidal activity.
However, these compounds have a high toxicity to warm-blooded animals.
The present invention provides, as new compounds, the pyridazine-(thiono)-thiolphosphoric acid esters of the general formula ##SPC2## In which R and R' each is alkyl with 1 to 4 carbon atoms, R" is alkyl with 1 to 3 carbon atoms or halogen, and X is oxygen or sulfur.
Preferably, R is ethyl or n- or iso-propyl, R' is n-propyl, n-butyl, isobutyl or tert
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