The mass spectra of 1- and 2-alkylbenzotriazoles

✍ Scribed by Alan R. Katritzky; Isolde B. Puschmann; David H. Powell; Adam P. Wells

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 195 KB
• Volume: 8
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/(sici)1098-1071(1997)8:5<459::aid-hc11>3.0.co;2-q

✦ Synopsis

The fragmentation patterns of a series of 1-and 2-alkylbenzotriazoles are recorded and interpreted in comparison with available literature data. 1-and 2-Substituted benzotriazoles are readily differentiated on the basis of the relative ease with which a 1-substituted isomer loses nitrogen compared with the corresponding 2-isomer, resulting in generally weak parent ions for the former and strong parent ions for the latter. This loss of nitrogen in the 1-isomer ultimately gives rise to a strong peak at m/z 104, which is small or absent in the 2-isomer. In addition, examination of the intensity and distribution of peaks clustered around m/z 118 reveals that weak signals with a maximum intensity at m/z 117 or 118 are indicative of the 1isomers, while strong signals with a maximum intensity at 119 or 120 are typical of the 2-isomers. Thus, isomers are distinguished by analysis of mass spectral cracking patterns.