Abstract
Pentaerythritol (115-77-5) is formed by the aldol condensation of acetaldehyde and formaldehyde, followed by a Cannizzaro reaction in alkaline medium. In addition, by-products such as dipentaerythritol (126-58-97), tripentaerythritol (78-24-0), bis-pentaerythritol monoformal (6228-26-8), and cyclic monopentaerythritol monoformal are formed in this reaction. The presence of formaldehyde significantly complicates the quantitative analysis of these compounds in reaction medium by silylation and gas-chromatographic procedures. A procedure for the elimination of the effect of formaldehyde on the precision and reproducibility of the determination of these products in aqueous solutions has been developed. This involves the use of hydroxylamine hydrochloride (5470-11-1) and then direct silylation of the aqueous solution.
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