Analyzing Pentaerythritol Stearate Homologs with NMR Spectroscopy

Abstract

A pentaerythritol stearate sample with unknown composition was analyzed by nuclear magnetic resonance (NMR) spectroscopy (i.e., 1H NMR, quantitative 13C NMR, DEPT135, 1H-1H COSY, 1H-1H NOESY, 1H-13C HSQC and 1H-13C HMBC). The results indicated that the sample contained mainly monopentaerythritol tetrastearate, but also had small amounts of monopentaerythritol tristearate, monopentaerythritol distearate, dipentaerythritol stearate and tripentaerythritol stearate, as well as a trace amount of multipentaerythritol stearate.

Keywords

• nuclear magnetic resonance (NMR)
• pentaerythritol
• stearate
• multipentaerythritol
• lubricant