申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0337815A1
公开(公告)日:1989-10-18
Certain novel 1-dimethylcarbamoyl-3-substituted-5-substituted-1H-1,2, 4-triazoles are insecticidally active and can be used, optionally in compositions also containing agronomically acceptable diluent or carrier, to combat insects, especially insects of the order Homoptera.
A process for preparing environmentally safe dicofol and its formulations
申请人:AGAN CHEMICAL MANUFACTURERS LTD.
公开号:EP0383054A2
公开(公告)日:1990-08-22
The present invention provides for an improved practical process for producing DDTr-free p,p′-dicofol and its formulations substantially free of the practically inactive o-p′-dicofol comprising either directly recrystallizing technical dicofol from a suitable solvent such as acetic acid or alkanes, or alternatively preparing the p,p′-dicofol by the steps of (a) dehydrohalogenating technical DDT to give DDE; (b) chlorinating DDE to give Cl-DDT; and (c) hydrolyzing Cl-DDT to dicofol, wherein the technical DDT is initially recrystallized from a suitable solvent such as lower alkyl alcohols and then recrystallizing the resulting p,p′-dicofol from a suitable solvent such as acetic acid or alkanes.
Procédé pour deshydrochlorer les 1,1-bis(r-phényl)-2,2,2-trichloroéthanes
申请人:ELF ATOCHEM S.A.
公开号:EP0519807A1
公开(公告)日:1992-12-23
L'invention concerne un procédé de déshydrochloration des 1,1-bis(R-phényl)-2,2,2-trichloroéthane à l'aide d'une solution aqueuse d'un hydroxyde alcalin caractérisé en ce qu'on opère en l'absence de solvant et en présence d'un agent de transfert de phase.