Über Wuchsstoffe der Auxin‐ und der Bios‐Gruppe

Abstract

A u x i n -a , C18H3Z05, enthalt nach der analytischen Untersuchung eine Carboxylgruppe, drei alkoholische Hydroxyle, eine Doppelbindung und einen Kohlenstoffring. Von den vier Sauerstoffatomen des Auxi nsb, C,,H,,,O,, liegen zwei ebenfalls in einer Carboxylgruppe, eines in eineni alkoholischen Hydroxyl und eines in einer Ketogruppe vor. Auch Auxin-b enthalt eine Doppelbindung und einen Kohlenstoffring. Die M ti t a r o t a t io n , welche die Losungen beider Auxine zeigen, wird durch die Rildung von L a c t o n e n verursacht; aus dem zeitlichen Verlauf der Mutarotation schlossen wir, dal.3 es 3, Der 1.G. F n r b e r i i n d u s t r i e A . G . , insbesondere Hrn. Prof. HBrlein, Elberfeld, mochtcn wir fiir die mannigfache Unterstutzung unserer Arbeiten auch an dieser Stelle danken.

Phytohormones, by F.W. Went ... and Kenneth V. Thimann ...

“…The rapid development of the field has resulted, as would be expected, in the publication of a number of reviews and summaries. Such reviews have rarely more than temporary interest, and many of these are already only of historical value (Babicka, 1934;Cholodny, 1935a;Kogl, 1932 The newer and more extensive reviews are those of du Buy and Nuernbergk (1932, Erxleben (1935), von Guttenberg (1932,1933,1934,1935,1936), Heyn (1936), Jost (1935), Kogl (1935Kogl ( , 1935aKogl ( , 1936, Haagen Smit (1935), Stiles (1935), Thimann (1935, 19366), Went i (19356, 1936a), and F. A. F. C. Went^(1934C.…”

“…It was then found that auxin b and, later, synthetic indole-3-acetic acid (Thimann and Koepfli, 1935;Kogl, 1935) were as active in root formation as the purest Rhizopus preparation.…”

“…z-Inositol (Bios I) was inactive. Recently, however, one of the most important of the factors, biotin, has been isolated in a pure state by Kogl (1935Kogl ( , 1936 and a sample of this, from one of the last stages of purification, was tested in the same way (u). This work, which the authors carried out in cooperation with Professor Kogl, who supplied the biotin, showed a remarkable effect, one example of which is given in Figure 55 (cf.…”

Plant Growth-Substances. Their chemistry and applications, with special reference to synthetics

“…of indole in the course of preparing indole ethylamine by the method of Majima and Hoshino (1925). Kogl (1935). Auxin-a is very stable towards acids, but is readily decomposed by alkalis.…”

“…Auxin-a lactone, distilled with potassium hydrogen sulphate, yielded a substance probably identical with auxin-b. (Kogl, 1935). Kogl (1938) has pointed out: "The formula of auxin-a contains seven asymmetric carbon atoms; any organic chemist knows what that implies.…”