✦ LIBER ✦

An unexpected methyl loss observed in electron ionization of chalcones

✍ Scribed by C. Ardanaz; J. Kavka; F. H. Guidugli; D. Favretto; P. Traldi

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 122 KB
Volume: 12
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19980214)12:3<139::aid-rcm128>3.0.co;2-g

No coin nor oath required. For personal study only.

✦ Synopsis

A careful analysis of the electron ionization mass spectra of chalcones reveals the presence of [MÀ15]

Á and [MÀ16] ions which, by collision experiments, accurate mass measurements and deuterium labelling have been proved to originate by primary methyl and methane loss respectively. These findings suggest the existence of a population of molecular ions of chalcone exhibiting a structure different from the dibenzocycloheptadienone structure proposed in the literature.

📜 SIMILAR VOLUMES

An ESR study of electron loss and electr

An ESR study of electron loss and electron capture by silver (I) ions in methyl cyanide

✍ Martyn C.R. Symons; D.Robert Brown; George W. Eastland 📂 Article 📅 1979 🏛 Elsevier Science 🌐 English ⚖ 343 KB

Exposure of solutions of siber (I) perchlorate m mcthl I eanidr to 6OCo y-rays ilt 77 I; gave \_ag(iI) and Ag(O) ccntrrs in addition to radial-formed from the solvent. Their ESR spectra shoved h>prrfine fcaturrs from Io9\_Ag and I\*'&! together \\*ith features from tburequivaknt 14N nuclei The resul

Multipolarity effects in ionization of t

Multipolarity effects in ionization of the inner level of an atom by an electron impact in extended fine structures of K and L spectra of electron energy losses

✍ V.I. Grebennikov; D.E. Guy; Y.V. Ruts; D.V. Surnin; O.R. Zheltysheva 📂 Article 📅 2005 🏛 Elsevier Science 🌐 English ⚖ 243 KB

Mechanism of the formation of a dehydrat

Mechanism of the formation of a dehydrated ion by an unusual loss of oxygen at the 4′-carbonyl group of abscisic acid methyl ester in electron ionization mass spectrometry

✍ Masahiro Inomata; Nobuhiro Hirai; Naohito Takeda; Hajime Ohigashi 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 215 KB

## Abstract Methyl ester of abscisic acid (ABA), a plant hormone, gives a dehydrated ion at __m__/__z__ 260 in electron ionization mass spectrometry (EI–MS). This dehydrated ion had been considered to be derived only from the elimination of the tertiary hydroxyl group at C‐1′. We found that 34% of