質量分析法による低級アルコールのエチレンオキシド及びプロピレンオキシド付加物の定性分析

概要

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In recent years addition compounds of lower alcohols with ethylene oxide (EO) and/or propylene oxide (PO) have exclusively been investigated and utilized as the principal constituents for a brake fluid in automobiles. In this work, it was attempted to determine the species of alcohols (methanol or ethanol) used as raw materials, the addition number of molecules of EO and PO, and their arrangement (EO-PO or PO-EO) in the block addition compound by mass spectrometry. It was verified by the analysis of the mass spectra that a cleavage of these compounds expressed as the formula -R-O-R-O-R- (R : -CH2-CH2- or -CH2-CH (CH3) -) occurred on the O-R linkage and a positive charge remained on the R fragment. s Based on these results, it was possible to identify the molecular structures by the consecutive procedure as follows. (1) The possible structures are determined by the molecular weight obtained from the mass spectra. (2) The distinction o alcohols, the number of molecules of EO and PO added and their arrangement are determined by the fragment peaks on the mass spectra.
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