کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1315778 | 976069 | 2006 | 7 صفحه PDF | دانلود رایگان |

Electron impact and methane chemical ionization mass spectra were obtained following gas chromatography/mass spectrometry for several gem-difluoropropargyl compounds, which had been synthesized as potential intermediates for synthesis of gem-difluoromethylene-containing C-3 acetylenes. EI spectra were variable with respect to the presentation of molecular ions, depending on substituent functional groups present. Methane-CI spectra were characterized by loss of 19 mass units from molecular weight with all compounds examined. These [M − 19]+ ions often presented as base peaks of the CI spectra, and were more reliably present and abundant than [M + 1]+ ions for these compounds. These ions could have been formed by elimination of HF from the protonated molecules under conditions of methane chemical ionization.
Under CI-methane conditions, [M − 19]+ ions derived from gem-difluoropropargyl structures offer reliable information with respect to their molecular weights and may be useful for structure determination.Figure optionsDownload as PowerPoint slide
Journal: Journal of Fluorine Chemistry - Volume 127, Issue 1, January 2006, Pages 126–132