Pure (S)(+)-linalool can be obtained from oil of coriander by formation and recrystallization of its 3,5-dinitrobenzoate ester followed by regeneration and distillation.

(S)(+)-Linalool from Oil of Coriander

A method has been discovered for attracting Colorado potato beetles to an area of object or area, which method involves treating the object or area with a Colorado potato beetle attracting composition which contains a carrier material and a Colorado potato beetle attracting effective amount of (S)-3,7-dimethyl-2-oxy-cct-6-ene-1,3-diol. (Fig. 4.A.).

Attractant pheromone for the Colorado potato beetle

Eine grundlegende Verbesserung der DC-Analyse von Sterinderivaten wurde durch Trennung der Sterin-3,5-dinitrobenzoate auf magnesiumoxidhaltigen Schichten erzielt. Die Sichtbarmachung erfolgt durch Fluoreszenzloschung auf den Fluorescinenthaltenden Platten. Gegenuber der fruher beschriebenen Trennung der Acetate wird die Nachweisempfindlichkeit um das zehnfache gesteigert. An Hand von Modellmischungen war es moglich, Gesetzmasigkeiten der Trennung in Abhangigkeit von der Zahl der C-Atome sowie Zahl und Stellung der Doppelbindungen aufzuzeigen.



Investigation of Sterol Mixtures II: Qualitative Analysis by Thin-Layer Chromatography



A basic improvement in the TLC-analysis of sterol derivatives was achieved by carrying out the separation of 3,5-dinitrobenzoates of sterols on layers containing magnesium oxide. Visualization was accomplished by quenching of fluorescence on fluorescin-containing plates. Compared to separation of acetates, as described earlier, sensitivity of detection is ten times increased. Using model mixtures, it was possible to show the pattern of separation as a function of the number of C-atoms and the number and position of double bonds.

S Juvonen

Papers

Abtrennung von terpenalkoholen aus terpengemischen als 3,5-dinitrobenzoate auf kieselgel-dünnschichten