Synthesen von Terpenen aus Isopren

Fifty Years of Ziegler Catalysts: Consequences and Development of an Invention

“…“our results produced no evidence at all for the formation of radical intermediates in the course of the alkali metal polymerization. We emphasize this particularly in view of the statements made by Midgley and Henne13 and Wagner‐Jauregg 14. On the contrary, all the evidence obtained to date speaks for these processes being entirely due to organometallic syntheses.”…”

50 Jahre Ziegler‐Katalysatoren: Werdegang und Folgen einer Erfindung

“…“Für die Bildung radikalartiger Zwischenprodukte im Verlaufe der Alkalimetallpolymerisation haben unsere Ergebnisse keinerlei Anhaltspunkte geliefert, was wir mit Rücksicht auf diesbezügliche Äusserungen von Midgley und Henne13 sowie Wagner‐Jauregg14 betonen möchten. Es spricht vielmehr bisher alles dafür, dass sich diese Vorgänge widerspruchslos und ausschließlich als metallorganische Synthesen deuten lassen.”…”

The Biosynthesis of Phenolic Plant Products

“…The phenolic compounds elaborated by plants range in structural type over 743 a wide spectrum, from such simple phenols as hydroquinone (1), /?-hydroxyacetophenone (2) and anethole (3), to such complex compounds as emodin (4) and the dianthrone hypericin (5). Present-day knowledge of the main routes by which phenolic compounds of these and many other types are synthesized in the plants, is based in part upon direct experimental evidence obtained with the use of radioactive tracer technics and in part upon systematic and compelling speculations that possess an impressive degree of coherence and consistency.…”