Výsledky vyhledávání - "C. C. Van De Sande"

Studies in Organic Mass Spectrometry. XIV: Investigation of Electron Impact Induced Isomerisation of 2′-Hydroxy-Acrylophenones and Chroman-4-ones

Autor: M. Vandewalle, C. C. Van De Sande

Publikováno v: Bulletin des Sociétés Chimiques Belges. 82:775-783

The mass spectral behaviour of nine pairs of isomeric 2′-hydroxy-acrylophenones and chroman-4-ones is outlined. Metastable ion analysis has been applied to investigate isomerisation prior to fragmentation. A comparison is made between behaviour und

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a0da6799995bb03bbe6920cfd09bf88c
https://doi.org/10.1002/bscb.19730821109

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On The Occurrence of Fries Type Reactions in Polyphosphoric Acid. Synthesis of 2-alkyl Substituted 4-Chromanones from Phenols and α, β-Unsaturated Carboxylic Acids

Autor: M. Vandewalle, C. C. Van De Sande

Publikováno v: Bulletin des Sociétés Chimiques Belges. 82:705-710

The condensation of phenols and α, β-unsaturated carboxylic acids in polyphosphoric acid is investigated. Spectroscopic data are included.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e0f6b5767b12dbd0b630274d935bc3f4
https://doi.org/10.1002/bscb.19730820912

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Studies in Organic Mass Spectrometry. XXI: Cyclic bromonium ions from ω-phenoxy alkylbromides

Autor: C. C. Van De Sande

Publikováno v: Bulletin des Sociétés Chimiques Belges. 84:785-790

ω-Phenoxy alkylbromides are used as model compounds in the determination of factors governing the abundances of cyclic bromonium ions in the gas phase.

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https://doi.org/10.1002/bscb.19750840713

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Evidence for the acyclic structure of the stable ϵ-Fission product ions from α, β-unsaturated aldehydes, ketones and methylesters

Autor: C. C. Van De Sande, C. De Meyer, A. Maquestiau

Publikováno v: Bulletin des Sociétés Chimiques Belges. 85:79-87

Collision Induced Dissociation (CID) spectra indicate that the stable ϵ-fission product ions (lifetimes > 10−5 sec) produced from α, β-unsaturated aldehydes and methylketones do not have the widely accepted dihydropyrillium ion structure propose

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9fb6ccc55789eed62c411d7a348c7b32
https://doi.org/10.1002/bscb.19760850108

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Metastable ion Characteristics. XXXXIII—separation and comparison of collisional activation spectra and metastable ion spectra

Autor: Timothy Wachs, Fred W. McLafferty, C. C. Van de Sande

Publikováno v: Organic Mass Spectrometry. 11:1308-1312

Additional ion acceleration in a separate collision chamber in the field free drift region makes it possible to add extra kinetic energy to those ions undergoing decomposition in the chamber. In this way product ions formed in the collision chamber (

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0539f176d1a883ffa96b792c2f415f6c
https://doi.org/10.1002/oms.1210111213

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Chemical ionization mass spectrometry of bifunctional cyclopentanes and cyclohexanes. A correlation between stereochemistry and chemical ionization spectra

Autor: F. Van Gaever, C. C. Van De Sande, J. Monstrey

Publikováno v: Organic Mass Spectrometry. 12:200-204

A correlation has been fround between the stereochemistry of 3-methoxyeyclopentyl and 3-methoxyccyelohexyl acetic acid esters and their methane or isobutane themical ionizaion spectra: only the cis compounds yield quasimolecular ions and the [MHCH3OH

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5a6c670d853fac6847fbbc276d7702e1
https://doi.org/10.1002/oms.1210120404

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Chemical Ionization Mass Spectrometry: A Useful Stereochemistry Probe

Autor: C. C. Van De Sande, J. Monstrey, F. Van Gaever, P. Sandra

Publikováno v: Zeitschrift für Naturforschung B. 32:573-580

The helium charge exchange and the isobutane chemical ionization spectra of 4-methoxy cyclohexanecarboxylic acid ethyl esters (1c and 1t), 2,6-dimethyl-4-hydroxytetrahydropyranes (2c and 2t), 2,4,6-trimethyl-4-hydroxytetrahydropyranes (8c and 3t), an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::37df0d07a8fedeff740b2a3944c2556d
https://doi.org/10.1515/znb-1977-0517

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Studies in organic mass spectrometry. XXIII-Evidence for the occurrence of cyclic sulphonium ions in the gas phase

Autor: C. C. Van De Sande

Publikováno v: Organic Mass Spectrometry. 11:130-134

Functional group interaction occurs in the loss of a phenoxy radical from the molecular ions of ω-phenylthio alkylphenylethers OO(CH2)nSO (n = 2–6). Labelling data provide evidence for the S-phenyl thietanium, S-phenyl tetrahydrothiophenium and S-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a2329f15916da346e8ff2ee16f65ab03
https://doi.org/10.1002/oms.1210110206

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The isobutane chemical ionization mass spectra of 2-methyl substituted 1,3-cycloalkanediol diacetates and dimethyl ethers

Autor: C. C. Van De Sande, F. Vangaever, L. D'Haenens

Publikováno v: Organic Mass Spectrometry. 14:145-148

The isobutane chemical ionization mass spectra of 2-methyl-1,3-cyclopentane and 1,3-cyclohexanediol diacetates and dimethyl ethers reveal that the proton bridge in the protonated cis diol derivatives is sensitive to conformational and steric effects.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5f4177474c17d731a1a54d38c69512a2
https://doi.org/10.1002/oms.1210140308

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