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1

Digitale Medien

Laser-induced vaporization mass spectrometry of rifamycins (1989)

Bravo, P. ; Cavalleri, B. ; Zerilli, L. F. ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 18 (1989), S. 301-307

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ISSN: 0887-6134

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The mass spectra of many rifamycins cannot be obtained by electron ionization (EI) owing to their thermal decomposition. When a laser beam is used to vaporize the sample through an optic fibre inserted in a hollow probe which reaches the sample cup, decomposition is minimized and the EI spectra show abundant molecular ions and fragments of structurally high diagnostic value. These ionic species are easily observed owing to the lack of chemical noise often present in soft ionization methods, such as direct liquid chemical ionization and fast atom bombardment.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bms.1200180504

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2

Digitale Medien

Electron impact mass spectrometry of ethyl esters of halogenated acetic acids (1992)

Catinella, Silvia ; Favretto, Donata ; Traldi, Pietro ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 27 (1992), S. 179-182

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ISSN: 0030-493X

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The behaviour of a series of differently halogenated acetic acid ethyl esters was studied using electron impact and metastable ion techniques. The presence of different halogens strongly influences the fragmentation pathways and also the kinetic energy release values associated with some decomposition routes. By mass-analysed ion kinetic energy spectrometry, a composite metastable peak was detected for the transition CF2BrCO+ → CF2Br+, and rationalized on the basis of two different structures for the precursor ion.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/oms.1210270305

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3

Digitale Medien

Fluorine influence in the mass spectrometric patterns in β-hydroxy alkyl aryl sulphoxides. Part 5For part 4 see Ref. 1 (1990)

Seraglia, R. ; Traldi, P. ; Bravo, P. ; [weitere]

New York, NY : Wiley-Blackwell

Rapid Communications in Mass Spectrometry 4 (1990), S. 376-380

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ISSN: 0951-4198

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: The electron ionization mass spectrometry of some β-hydroxy alkyl aryl sulphoxides halogenated in the γ-position is described and the mechanism of the common fragmentation patterns are discussed with the aid of linked scans at constant B/E, mass-analysed ion kinetic energy spectra and labelling experiments. The influence of the presence of halogens is also discussed.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/rcm.1290041006

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4

Digitale Medien

Influence of different ionization conditions on the mass spectrometric behaviour of some fluorinated acyclic nucleoside analogs (1995)

Favretto, Donata ; Traldi, Pietro ; Bravo, Pierfrancesco ; [weitere]

New York, NY : Wiley-Blackwell

Rapid Communications in Mass Spectrometry 9 (1995), S. 1127-1134

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ISSN: 0951-4198

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: The behaviour of three fluorinated acyclic nucleoside analogs has been examined under different ionization conditions, i.e. by electron ionization, fast-atom bombardment and positive-ion chemical ionization using methane, isobutane and ammonia as reactant gases. The protonated molecules have been studied by collisional spectroscopy. In general, protonation takes place on the functional groups exhibiting a proton affinity higher than that of the reactant species but some discrepancies are present. They have been explained by the presence of quasi S—H—F structures implicating proton bridging between sulphur and fluorine atoms.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/rcm.1290091210

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5

Digitale Medien

Fast atom bombardment and angle resolved mass spectrometry in the structural and stereochemical characterization of homochiral 3-deoxy-3-fluoro muscarins (1991)

Bravo, P. ; Viani, F. ; Ghezzo, E. ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 20 (1991), S. 357-360

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ISSN: 1052-9306

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The mass spectrometric behaviour of four homochiral 3-deoxy-3-fluoro muscarins has been studied by means of fast atom bombardment. Neither naturally occurring nor collisionally induced decompositions were effective for the structural characterization of the different diastereoisomers. In contrast such results have been easily obtained by angle-resolved mass spectrometry, i.e. by the study of the variation of absolute abundance of collisionally induced decomposition products versus scattering angle.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bms.1200200605

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6

Digitale Medien

Fast-atom bombardment mass spectrometry and metastable-ion studies for the characterization of isomeric fluorosugars (1991)

Kiremire, B. T. ; Chirello, D. ; Traldi, P. ; [weitere]

New York, NY : Wiley-Blackwell

Rapid Communications in Mass Spectrometry 5 (1991), S. 591-595

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ISSN: 0951-4198

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: Characterization of stereoisomeric 3,4-dideoxy-3-fluoro-hexoses has been carried out using fast-atom bombard-ment. Diagnostic fragments were observed in the daughter-ion spectra of the [M-H]- and [M+H]+ ionic species. Notable differences were also observed in the relataivae abundances of ionic species corresponding to [M-H]-, [M-H-HF]- and [C11H11O2]- ions.

Zusätzliches Material: 4 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/rcm.1290051205

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7

Digitale Medien

Unimolecular decomposition of M+· and [M + H]+ species of some fluorosubstituted acyclic nucleoside analogs (1991)

Favretto, Donata ; Traldi, Pietro ; Bravo, Pierfrancesco ; [weitere]

New York, NY : Wiley-Blackwell

Rapid Communications in Mass Spectrometry 5 (1991), S. 72-77

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ISSN: 0951-4198

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: Electron ionization and fast-atom bombardment mass spectrometry are shown to provide a valid analytical tool for the structural characterization of the title compounds. In fact, diagnostic fragmentation pathways were observed depending on the presence of different substituents (benzyloxy, p-tolylthio, p-tolylsulphinyl) as swell as of different bases. Regioisomeric compounds could be differentiated by kinetic energy release measurements.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/rcm.1290050206

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8

Digitale Medien

A comparison of the fragmentation patterns of 5-fluoromethyl-3,4-disubstituted isoxazoles and 5-methyl analogsPaper delivered at the 11th Informal Meeting on Mass Spectrometry, Budapest, 1993. (1993)

Favretto, Donata ; Traldi, Pietro ; Bravo, Pierfrancesco ; [weitere]

New York, NY : Wiley-Blackwell

Rapid Communications in Mass Spectrometry 7 (1993), S. 665-669

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ISSN: 0951-4198

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: The influence of fluorine substitution on the fragmentation processes of some substituted isoxazoles has been studied by comparing the electron-impact-induced mass spectrometric behaviour of some 5-monofluoromethyl-3,4-disubstituted isoxazoles with that of the corresponding 5-methyl analogs. Some interesting and unusual cleavages have been detected and a rationale has been developed for them on the basis of metastable ion studies and accurate mass measurements. Evidence has been found of the influence of fluorine in the stabilization of molecular and fragment ions.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/rcm.1290070723

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9

Digitale Medien

Mass spectrometry of sulphur-containing compounds.O. Bortolini and P. Traldi, J. Chem. Soc. Perkin Tr.II (submitted). 3. The behaviour of some diastereomeric β-hydroxy-γ-fluoro alkyl aryl sulphoxides (1989)

Traldi, P. ; Bravo, P. ; Resnati, G. ; [weitere]

New York, NY : Wiley-Blackwell

Rapid Communications in Mass Spectrometry 3 (1989), S. 26-29

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ISSN: 0951-4198

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: The electron ionization and chemical ionization mass spectrometry of some diastereomeric β-hydroxy-γ-fluoro alkyl aryl sulphoxides is described and the mechanisms of the common fragmentation patterns are discussed with the aid of linked scans at constant B/E and at constant B2/E, mass-analysed ion kinetic energy spectra and labelling experiments.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/rcm.1290030205

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10

Digitale Medien

Sur les complexes formés par le trifluorure de bore avec les sulfoxydes, aminoxydes, phosphinoxydes et arsinoxyde: Aspects généraux des spectres de RMN (1H, 11B, 19F et 31P) (1973)

Bravo, R. ; Durand, M. ; Laurent, J.-P.

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 5 (1973), S. 357-360

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ISSN: 0030-4921

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: Various complexes (RnMO·BF3) of boron trifluoride with sulphoxides, aminoxides, phosphinoxides and arsinoxides have been prepared and investigated using proton, fluorine (at variable temperature) boron and phosphorus resonance. A comparison with similar adducts containing a co-ordinative O—B bond is presented.

Notizen: Les spectres de résonance magnétique nucléaire (1H, 11B, 19F et 31P) des complexes RnMO·BF3 formés par le trifluorure de bore et des sulfoxydes, aminoxydes, phosphinoxydes et arsinoxydes ont été obtenus. Les paramètres (déplacements et couplages) caractérisant ces spectres sont comparés à ceux de composés similaires renfermant également une liaison de coordination O·B.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mrc.1270050803

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