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Cyclization of diaza[6]helicenes to monoazacoronenes under electron impact

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Staab,  Heinz A.
Department of Organic Chemistry, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Rentzea, M., Diehm, M., & Staab, H. A. (1994). Cyclization of diaza[6]helicenes to monoazacoronenes under electron impact. Tetrahedron Letters, 35(45), 8361-8364. doi:10.1016/S0040-4039(00)74407-8.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-A8AB-C
Abstract
Electron impact (EI)-induced cyclizations of 1,16-diaza[6]helicene (1), of 1,14-diaza[6]helicene (2) and of 3,14-diaza[6]helicene (3) to monoazacoronenes (abundant loss of HCN and H) were investigated through their source spectra supported by accurate mass measurements, their unimolecular metastable ion (MI) spectra, and their high-energy (8KeV) collision-induced dissociation (CID) tandem mass spectra obtained with a four-sector mass spectrometer. Electron impact (EI)-induced cyclizations of diaza[6]helicenes (1–3) to monoazacoronenes were investigated through their mass spectra obtained with a four-sector mass spectrometer.