Stearic Acid Methylester

Oleic acid methylester 9,10-Epojcy stearic acid methylester too... 

Linoleic acid methylester 9,10-12,13-Diepoxy stearic acid methylester 9,10 (12,13)-Epoxy 12-(9)-octarfeceooic 85... 

Lindeic acid methylester 9,10-12,13-Diepoxy stearic acid methylester 13... 

Oleic acid methylester 9,10-Epoxy stearic acid rriethylester 63... 

The sodium salts of Q -sulfo fatty acid methylesters are soluble in water and resistant to hydrolysis in the pH range of 3-10. They are also only slightly sensitive to water hardness and offer good detergency in combination with other surfactants. Their foaming ability decreases strongly from the lauric methylester to the stearic methyl ester. 

The number of unsaturated bonds can be determined by a titration with a standard solution of bromine dissolved in glacial acetic acid. The sample is also dissolved in glacial acetic acid to which sodium and ammonium acetate are added, so as to give a final concentration of 0-5 and OT M respectively. The cathodic current of bromine is measured with a short circuit system using a rotating platinum indicator, and a calomel or chloranil reference electrode at the potential of the reference electrode. Several unsaturated open chain compounds and terpenes have been titrated in this way.( ) Other modifications of this technique have been used to determine the amount of unsaturation in fats in methanolic solutions. The standard solution of bromine is prepared in methanol, saturated with sodium bromide, and the methylester of stearic acid is added to suppress the maxima. If the methanolic solution is acidified, OT M potassium bromate with OT M sodium bromide can be used instead of bromine. The bromine generated in homogeneous solution can be used to analyse xylenol and cresol fractions of coal-tars. Other phenolic compounds may be similarly determined. The method was used for the determination of small concentrations of styrene... 

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