- Evaluation of the α-phenylvinyl cation as a chemical ionization reagent for the differentiation of isomeric substituted phenols in an ITMS
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Ion-molecule reactions between the α-phenylvinyl cation and isomeric naturally occurring phenols were investigated using a quadruple ion trap mass spectrometer. The α-phenylvinyl cation m/z 103, generated by chemical ionization from phenylacetylene, reacts with neutral aromatic compounds to form the characteristic species: [M + 103]+ adduct ions and the trans-vinylating product ions [M + 25]+, which correspond to [M + 103]+ adduct after the loss of benzene. Isomeric differentiation of several ring-substituted phenols was achieved by using collision-induced dissociation of the [M + 103]+ adduct ions. This method also showed to be effective in the differentiation of 4-ethylguaiacol from one of its structural isomers that displays identical EI and EI/MS/MS spectra. The effects of gas-phase alkylation with phenylvinyl cation on the dissociation behavior were examined using mass spectrometryn and labeled derivatives.
- Begala, Michela
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- Chemoselective photorearrangements of diazinobarrelenes. Deuterium labeling study
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(Chemical Equation Presented) Chemoselective photorearrangements of pyrazino-, quinoxalino-, and benzoquinoxalinobarrelenes were investigated by deuterium-labeling experiment. Photolysis of pyrazinobarrelene 4 and quinoxalinobarrelene 5 with 300 nm region
- Chen, Ann-Cheng,Chuang, Gary J.,Villarante, Nelson R.,Liao, Chun-Chen
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- Aqueous Oxidations Started by TiO2 Photoinduced Holes Can Be a Rate-Determining Step
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In aqueous TiO2 photocatalytic hydroxylation of weakly polar aromatics, a series of inverse H/D KIEs of 0.7–0.8 were observed, which is different than the normal H/D kinetic isotope effects (KIEs) usually observed for polar aromatics. This result indicated that the oxidation started by photo-induced hvb + can be the rate-determining step.
- Gong, Yuanzheng,Yang, Chun,Ji, Hongwei,Chen, Chuncheng,Ma, Wanhong,Zhao, Jincai
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supporting information
p. 2048 - 2051
(2017/08/23)
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- PYRIDONE DERIVATIVE HAVING TETRAHYDROPYRANYLMETHYL GROUP
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The present disclosure provides novel compounds or salts thereof, or crystals of the compounds or the salts, which inhibit Axl and are useful in the treatment of a disease caused by hyperfunction of Axl, the treatment of a disease associated with hyperfunction of Axl, and/or the treatment of a disease involving hyperfunction of Axl. The present disclosure provides pyridone derivatives having a tetrahydropyranylmethyl group represented by the following formula (I) having various substituents, or salts thereof, or crystals of the compounds or the salts, wherein R1, R2, R3, R4, R5, W, X, Y, and Z are each as defined in the specification:
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Paragraph 0409-0412
(2017/07/14)
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- Microwave-assisted deuterium exchange: The convenient preparation of isotopically labelled analogues for stable isotope dilution analysis of volatile wine phenols
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This study reports the convenient, low cost, one-step synthesis of labelled analogues of six volatile phenols, guaiacol, 4-methylguaiacol, 4-ethylguaiacol, 4-ethylphenol, eugenol and vanillin, using microwave-assisted deuterium exchange, for use as intern
- Crump, Anna M.,Sefton, Mark A.,Wilkinson, Kerry L.
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p. 261 - 263
(2014/06/09)
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- SUBSTITUTED PYRIMIDINES
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Disclosed herein are substituted pyrimidine-based endothelin modulators of Formula I, processes of preparation thereof, pharmaceutical compositions thereof, and methods of use thereof.
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Page/Page column 38-39
(2008/12/07)
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