Determination of Unsaturation by Microhydrogenation

Abstract

ditions as calcium, it is entirely possible that magnesium can be estimated in the filtrate from the calcium oxalate precipitation. ACKNOWLEDGMENTThe authors wish to express their appreciation to L. P. Pepkowitz and J. F. Flagg for helpful suggestions during the course of this work and for reviewing the manuscript. LITERATURE CITED(1) Assoc. Offic. Agr. Chemists, "Official and Tentative Methods of Analysis," 6th ed., p. 654, 1945.

The nature of the double bond in low molecular weight polyisobutylenes and “polybutene” copolymers

“…The M, was determined by standard techniques.2 The total unsaturation was measured by microhydrogenation. 3 The results are expressed as the percent of the theoretical unsaturation (i.e., one double bond per molecule). The vinylidene and trisubstituted olefin contents were measured by PMR and/or infrared spectroscopy, as described in the next section.…”

Stereospecific Hydrogenations V: Hydrogenation Rates Using Palladium-on-Poly-S-leucine and Palladium-on-Poly-S-valine

“…All hydrogenations were conducted at a temperature of 36.0". The hydrogenation procedure of Ogg and Cooper (14) was used for these studies. In all studies, 30.0 mg. of catalyst was employed along with 4 ml.…”

Seasonal Composition of Temperate Plankton Communities: Fatty Acids1

“…Further checks were made on a nonpolar SE-30 column and by hydrogenating the esters (Ogg and Cooper 1949) and then rechromatographing the sample. Peak areas were calculated by multiplying peak height by the width at half-peak height, from which the weight per cents of the fatty-acid methyl esters were determined without further correction.…”

“…Peaks were identified from the retention times of standard esters and by plotting the relationship between the logarithms of retention times, relative to methyl stearate, against the carbon numbers of the ho,mologous series. Further checks were made on a nonpolar SE-30 column and by hydrogenating the esters (Ogg and Cooper 1949) and then rechromatographing the sample. Peak areas were calculated by multiplying peak height by the width at half-peak height, from which the weight per cents of the fatty-acid methyl esters were determined without further correction.…”