Tandem Oxidation/Rearrangement of β-Ketoesters to Tartronic Esters with Molecular Oxygen Catalyzed by Calcium Iodide under Visible Light Irradiation with Fluorescent Lamp
It was found that β-ketoesters were directly transformed to the corresponding α-hydroxymalonic esters, tartronic esters, with molecular oxygen catalyzed by calcium iodide under visible light irradiation from fluorescent lamp. This reaction includes tandem oxidation/rearrangement and has received much attention from the viewpoint of reduction of energy consumption, labor, and solvents.
Use of substituted malonic acid derivatives as agents for combating pests
申请人:Bayer Aktiengesellschaft
公开号:US04698333A1
公开(公告)日:1987-10-06
Pesticidally active compounds of the formula ##STR1## in which R.sup.1 is an organic radical, R.sup.2 is hydrogen, trialkylsilyl, a hydrocarbon or acyl radical, and R.sup.3 and R.sup.4 independently are an amino, hydroxyl, hydroximino, alkoxy or like radical. Most of the compounds are new, as are various intermediates therefor.
Five-membered nitrogen-containing hetero-cyclic compounds and their use
申请人:Bayer Aktiengesellschaft
公开号:US04562185A1
公开(公告)日:1985-12-31
The present invention relates to combating pests with five-membered nitrogen-containing heterocyclic compounds of the formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3, X and Y have the meaning given in the description. Many of the compounds are new.
Substituierte Hydroxymalonsäurediamide, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Schädlingsbekämpfungsmittel
申请人:BAYER AG
公开号:EP0076957A1
公开(公告)日:1983-04-20
Die vorliegende Erfindung betrifft neue substituierte Hydroxy-maionsäurediamide der Formel (I)
in welcher
R für Alkyl mit mindestens 2 C-Atomen sowie für substituiertes Alkyl, gegebenenfalls substituiertes Alkenyl, gegebenenfalls substituiertes Cycloalkyl, gegebenenfalls substituiertes Aryl, gegebenenfalls substituiertes Heteroaryl steht.
Man erhält sie, wenn man substituierte Trimethylsilyloxymalonsäuredinitrile der Formel (II)
mit anorganischen Säuren verseift.
Die erfindungsgemäßen Stoffe eignen sich zur Schädlingsbekämpfung.