Preparation and Gas Chromatography of the Trimethylsilyl Derivatives of Resin Acids and the Corresponding Alcohols

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Abstract
Trimethylsilyl esters of resin and fatty acids and trimethylsilyl ethers of the corresponding alcohols can be prepared readily and quantitatively using hexamethyldisilazane and trimethylsilyl chloride in hydrocarbon solvent. Pyridine was found to be detrimental to formation of the esters. Polyester liquid phases cannot be used for the analysis of the trimethylsilyl esters. However, because the silyl esters are very rapidly hydrolyzed, a simple means is thus available to recover the free acids after preparative gas chromatographic separation with other, nonreactive column packings.