𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Electron Impact Ionization-induced Fragmentation of Uracil-fused Tetrathiafulvalenes

✍ Scribed by Javier Garín; Jesús Orduna; Ojärs Neilands; Vija Tilika

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
379 KB
Volume
10
Category
Article
ISSN
0951-4198

No coin nor oath required. For personal study only.

✦ Synopsis

The 70 eV electron ionization mass spectra of uracil-fused tetrathiafulvalenes have been studied by accurate mass measurement, metastable ion analysis and collision-induced dissociation. Changes in the structure of substituents, both in the tetrathiafulvalene moiety and on the N1 atom of uracil, cause important differences in the fragmentation scheme. The position of alkyl substituents in the uracil ring is unambiguously confirmed.

Much effort has been devoted to the synthesis of tetrathiafulvalene (TTF) derivatives'.' with a view to preparing new molecular materials. Nevertheless, reports on nitrogenbearing lTFs are relatively scarce. Thus, some pyrida~ino-~ and ~yrazino-~ fused TTFs have been described, but the synthesis of the corresponding pyrimidine derivatives has only recently been achieved by one of our groups? In this paper we report the mass spectrometric behaviour of the first uracil-based tetrathiafulvalenes 1-3, which are novel 7r-electron donors able to form intermolecular hydrogen bonds of nucleic acid base-pair type, as pointed out recently! Moreover, the present study unambiguously confirms the previous assumptionsa* ' of the regioselective deprotonation and alkylation of N,"-unsubstituted

📜 SIMILAR VOLUMES

Fragmentation of IsomericN-Quinolinylpht
Fragmentation of IsomericN-Quinolinylphthalimides on Electron Impact Ionization
✍ Weisz, Adrian; Andrzejewski, Denis; Mandelbaum, Asher 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 303 KB 👁 1 views

The isomeric 2, 3-, 5, 6-and 8-quinolinylphthalimides give rise to different electron impact ionization mass spectra, which permit easy distinction. The specific fragmentation processes are rationalized in terms of proximity effects and stabilization of cyclic ion structures. Collision-induced disso

Electron Impact Induced Fragmentation of
Electron Impact Induced Fragmentation of Dibenzo Crown Ethers
✍ Kalevi Pihlaja; Silke Lehmann; Werner Schroth; Michael Gäbler; Erich Kleinpeter 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 310 KB 👁 1 views

Six structurally related crown ethers have been studied by electron impact @I) mass spectrometry. From accurate mass measurements, metastabel ion and mass-analyzed ion kinetic energy (MIKE) spectra, plausible fragmentation pathways were deduced. All compounds showed very abundant molecular ions and

Stereospecific Fragmentation of 3-Dimeth
Stereospecific Fragmentation of 3-Dimethylaminocyclohexanols upon Electron Impact Ionization
✍ Vais, V.; Mandelbaum, A. 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 339 KB 👁 2 views

Stereoisomeric cisand trans-1-butyl-3-dimethylaminocyclohexanols have been previously reported to exhibit different electron impact (EI) mass spectra. The m/z 100 ion is obtained only from the cis-isomer. The [ C 6 H 14 N ] results of a collision-induced dissociation study are inconsistent with the

Electron ionization-induced fragmentatio
Electron ionization-induced fragmentation of diphenylphosphino- and diphenylphosphinoyl-substituted ferrocene derivatives
✍ Polášek, Miroslav; Štěpnička, Petr 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 335 KB 👁 1 views

Electron ionization mass spectra of several diphenylphosphino-and diphenylphosphinoyl-substituted ferrocenes of the general formula (1), ( 2), (3), (5) and ( 6) ] and of their deuterated analogues ) ] are reported. Fragmentation pathways for all compounds studied are PPh 2 /CO 2 D PPh 2 /CO 2 CD

Formation of benzimidazole derivatives d
Formation of benzimidazole derivatives during electron ionization induced fragmentation and pyrolysis of N-benzyl-o-nitroaniline
✍ Witold Danikiewicz 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 147 KB 👁 1 views

Decomposition of N-benzyl-o-nitroaniline during pyrolysis and upon electron ionization has been studied. Pyrolysis of N-benzyl-o-nitroaniline starts above 450 °C and yields 2-phenylbenzimidazole and 1-phenyl-1,3dihydrobenzimidazol-2-one as the main products. Upon electron ionization N-benzyl-o-nitro