Wh. Ding et al., CHEMICAL-IONIZATION MASS-SPECTRA OF LINEAR ALCOHOL POLYETHOXY CARBOXYLATES AND POLYETHYLENE-GLYCOL DICARBOXYLATES, Rapid communications in mass spectrometry, 8(12), 1994, pp. 1016-1020
The chemical ionization (CI) mass spectra of propylated linear alcohol
polyethoxy carboxylates (LAEC) and polyethylene glycol dicarboxylates
(PEGDC) have been determined. Olefin displacement of the alkyl chain
from the [M+H](+) ions of propylated LAEC formed the protonated polyet
hoxy carboxyl propyl ester, which then underwent a characteristic frag
mentation by first losing water and then ethylene oxides. The fragment
ation pattern for PEGDC [M + H](+) ions was similar to that of LAEC, e
xcept that the initial steps were displacement of one terminal propyl
formate (HCOOC3H7) followed by a neutral loss of CH2O. Strong peaks du
e to protonated molecules were observed in both LAEC and PEGDC. Produc
t-ion mass spectra obtained from chemical ionization gas chromatograph
ic/triple-stage quadrupole mass spectrometric studies supported the pr
oposed fragmentation mechanisms.