期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 15, 期 29, 页码 7139-7149出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200900403
关键词
dendrimers; fragmentation mechanisms; gas-phase reactions; mass spectrometry
资金
- Deutsche Forschungsgemeinschaft
- Fond der Chemischen Industrie
The mass spectrometric characterization of Frechet-type dendrons is reported. In order to provide the charges necessary for electrospray ionization, dendrons bearing an OH group at the focal point can be deprotonated and observed in the negative ion mode. Alternatively, the corresponding bromides can be converted to quaternary ammonium ions that can easily be detected in the positive mode. If the latter ions are subjected to collision-induced dissociation experiments, a fragmentation cascade begins with the dissociation of the focal amine. The focal benzyl cation quickly decomposes in a fragmentation cascade from the focal point to the periphery until the peripheral benzyl (or naphthylmethyl) cations are formed. Five different mechanisms are discussed in detail, three of which can be excluded based on experimental evidence. The cascade fragmentation is reminiscent of self-immolative dendrimers.
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