a u f m a n n und Dr. H . T h o m u ? Ail< d r m Dmttchen Institiit fur Fettfortchung, Milnster (Wrctf )Folgende ungesattigte Glyceride werden synthetisiert: 1-Stearo-2,3-di-a-elaeostearin, Tri-a-elaeostearin, 1,2-Dioleo-3-a-elaeostearin, l-Oleo-2,3-di-a-elaeostearin, 1,2-Dilinolo-3-a-elaeostearin und l-Linolo-2,3-di-a-elaeostearin. Die Darstellung erfolgt durch Umsetzung der entsprechenden 1-Monoglyceride mit den betreffenden Fettsaurechloriden. Von den so erhaltenen Glyceriden wird die Sauerstoff-Aufnahme mit Hilfe eines Filmografen messend verfolgt, die erhaltenen Kurven werden diskutiert und die Verfilmungseigenschaften der neuen Glyceride untersucht.Synthesis of Pure Glycerides of Elaeostearic Acid and their Behaviour during AutoxidationThe following unsaturated glycerides were synthesized: l-stearo-2,3-di-u-elaeostearin, tri-a-elaeostearin, 1,2-dioleo-3-~-elaeostearin, l-oleo-2,3-di-a-elaeostearin, 1,2-dilinolo-3-a-elaeostearin and l-linolo-2,3-di-a-elaeostearin. The synthesis was achieved through the reaction of the 1-monoglyceride with the relevant fatty acid chlorides. These synthetic glycerides were subsequently subjected to autoxidation. Amount of oxygen required for their autoxidation was followed with the help of a filmograph and the curves, obtained thereby are discussed. The film forming properties of these pure glycerides were investigated.Wie der eine von uns bereits friiher betont hat', ist die autoxydative Molekiilvergroflerung ein aus zahlreicheii Teilreaktionen zusammengesetzter Vorgang. Zunachs: ist verstandlich, dafl sich Isolenole und Konjuenole hierbei verschieden verhalten. Da echte Polymerisationen neben Kondensationen und C-C-neben C-0-Verkettungen moglich sind -oder diese Reaktionen gleichzeitig ablaufen -hat der eine von uns mit FETTE . S E I F E N . A N S T R I C H M I T T E L61. Jahrqany Nr 3 1958Sintesis de un glicerido elaiestearico puro y su comportamiento en la autooxidaci6n Se sintetizaron 10s siguientes gliceridos insaturados: l-esteari-2,3-di-u-elaiestearina, tri-a-elaiestearina, 1,2-diolei-3-u-elaiestearina, l-olei-2,3-di-a-elaiestearina, 1,2-dilinol-3-u-elaiestearina, y l-linol-2,3-di-a-elaiestearina. La preparacion se consigue por la reaccion del correspondiente, monoglicerido con el cloruro del respectivo Acid0 graso. En el glicerido asi obtenido se mide la adicion de oxigeno con ayuda de un filmografo. Se discuten las curvas asi obtenidas y se investigan las propiedades del nuevo glicerido.

Der Verlauf des Trocknungsvorganges von Tri-a-elaeostearin und a-Elaeostearo-dilinolin wird IR-spektrographisch verfolgt. Die Anderungen der charakteristischen Banden wahrend der Verfilmung werden anhand der IR-Spektren diskutiert. Application of Infra-Red Spectrography in Fats and Oils 111. Autoxidative Studies in case of Some Synthetic TriglyceridesThe authors have followed the course of film formation of tria-elaeostearin and a-elaeostearo-dilinolin with the help of IRspectroscopy. The changes taking place in the characteristic bands in the spectra during the process of drying and film formation have been discussed.

Exchange betweenChloride Ion and /-Butyl Chloride 2451 than with oxonine. No concentration of the dye could be reached high enough to preserve the homogeneity of the solution during the experiment and yet to raise the change in magnetic pull during the reduction above the limits of error of the method in its present state. Thus the magnetic measurement with thionine in alkaline solution at least confirms the result obtained potentiometrically, that the semiquinone formation constant is distinctly smaller than for oxonine, but no quantitative result could be obtained. Summary A differential magnetometric method is described by which the development of a semiquincme radical on partial reduction of organic dyestuffs can be recognized owing to the increment of susceptibility caused by the free radical. In some cases the difference in susceptibility is measured before and after adding the reducing agent (ascorbic acid), namely, in strongly acid solution of thiazine dyestuffs. In other cases the method of slow reduction is used, for example, in alkaline solution of oxonine, where glucose is added at the beginning, and the change of susceptibility is measured during the slowly progressing reduction. In the case of oxonine, the paramagnetic increment passes through a maximum.The maximum concentrations of the free radical, calculated from the magnetic data, agree fairly well with those values previously obtained by the potentiometric method. In addition the data show that for the dyestuffs examined here no noticeable dimerization of the radicals takes place although the concentrations of the dyes are more than a hundred times higher than in the potentiometric experiments formerly described.New York, N. Y.