Mass spectral fragmentation ofN1,N1-dimethyl-N2-azinylformamidines

✍ Scribed by RACZYŃSKA, E. D.; DECOUZON, M.; GAL, J.-F.; MARIA, P.-C.; TAFT, R. W.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 274 KB
• Volume: 33
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/(sici)1096-9888(1998100)33:10<1029::aid-jms729>3.0.co;2-w

✦ Synopsis

JMS Letters

Dear Sir,

Mass Spectral Fragmentation of N1,N1-Dimethyl-N2azinylformamidines

Polyfunctional nitrogen ligands present very interesting properties. In particular, they exhibit exceptionally high basicity. In many cases chelation of the proton by two basic nitrogen atoms is possible. This e †ect strongly increases the gas-phase basicity. The chelation e †ect of protons in the proton-transfer reaction in the gas phase and of hydrogen in the hydrogen bonding reaction in non-polar solvent has recently been studied for amidinazines.1h3 For our experimental studies in the gas phase we used Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. We report here the standard 70 eV mass spectra of N1,N1-dimethyl-N2azinylformamidines 1È4 (FDM*Aza). As model compounds we used a series of N1,N1-dimethyl-N2-phenylformamidines (FDM*X) for which mass spectral fragmentation has been already reported.4h9 Amidinazines 1È4 were synthesized by the same procedure as for the series of model formamidines FDM*X studied previously.10 Compounds 1 and 4 were recrystallized from