The condensation of maleic anhydride with tung oil: a new “constant” for oils

Woburn Iodine Absorption Method, Use in Combination with Partial Iodine Values for the Determination of Diene Numbers

“…The need for such differential halogen absorption methods was temporarily placed in doubt when in 1936 Kaufmann and Baltes (15) and subsequently Ellis and Jones (8) completed direct methods for determining the diene value, using maleic anhydride according to the Diels-Alder reaction. While a quantitative application of differential halogen absorption had been made only in the case of tung oil, the maleic anhydride addition methods were equally applicable to systems of two and three conjugated double bonds.…”

The reaction of nonconjugated unsaturated fatty acid esters with maleic anhydride

“…The reaction of maleic anhydride with conjugated unsaturated fatty acids and their derivatives is so well known that a discussion of this application of the Diels-Alder reaction is unnecessary. It has become the basis of methods for quantitatively determining the degree of conjugation in unsaturated fats (1,2,3) expressed as diene or maleic anhydride values.…”

Die Dienometrie im Dienst der Strukturforschung

“…Fur diesen Zweck hat sich die Ampullenausfuhrung am besten bewahrt, die in enger Anlehnung an die ursprungliche Methode von KAUFMANN und BAL-TES [4] in gleicher Weise fur beide Methoden Giiltigkeit hat, wobei lediglich in einem Fall mit Jodzusatz, im andern ohne Jodzusatz gearbeitet wird. Es sei hier nur am Rande erwahnt, dal3 bei der ELLIS-JONES-Dienzahlmethode [6] der Jodzusatz keineswegs den gleichen Zweck erfiillt, daB diese also fur eine Bestimmung der Pandienzahl nicht infrage kommt .…”