𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Electron impact induced cyclization of ortho-substituted diphenylmethanes

✍ Scribed by Joachim G. Liehr; A. Gareth Brenton; John H. Beynon; Wilhelm J. Richter

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
495 KB
Volume
16
Category
Article
ISSN
1076-5174

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Mass spectra of 2‐hydroxydiphenylmethane and its derivatives are characterized in the upper mass region by an abundant ion m/z 165. Metastable ion measurements reveal that this ion is formed from the molecular ion of the parent compound by elimination of H~2~O and hydrogen. A fluorenyl cation structure is proposed for this ion on the basis of identity of collision induced mass analyzed ion kinetic energy spectra of ion m/z 165 generated from 2‐hydroxydiphenylmethane and from fluorene. Four different pathways of formation of a fluorenyl cation are discussed. The contribution of each of these to the genesis of fragment m/z 165 was monitored in a reversed geometry instrument by measuring the first fragmentation in the first field free region and the second fragmentation in the second field free region.

📜 SIMILAR VOLUMES

Electron-impact-induced Ortho effects in
Electron-impact-induced Ortho effects in (O-carboxyphenyl)diphenylphosphine
✍ R. Srinivas; G. K. Viswanadha Rao; V. Ravinder 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 255 KB

## Abstract Proximity effects of the carboxyl group with the phosphorus atom in the molecular ion of (__o__‐carboxyphenyl)diphenylphosphine (1) leads to the loss of ĊHO to form the base peak at __m__/__z__ 277, which is totally absent in the (__m__‐ and __p__‐carboxyphenyl)diphenylphosphines. The m

Electron impact-induced decomposition of
Electron impact-induced decomposition of some substituted 7-ethoxycarbonylpyridopyrrolidenequinolines
✍ Adam S. Plaziak; Tomasz Girek; Wanda Śliwa 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 241 KB

The electron impact ionization mass spectrometric behaviour of three cycloadducts of 4,&benzo[ Llnaphthyridinum ethoxycarbonylmethylide with acrylonitrile, ethyl acrylate and diethyl maleate was studied with the aid of exact mass measurements and metastable transitions. The study showed that the ele

The electron-impact induced fragmentatio
The electron-impact induced fragmentation of substituted 4-styrylquinolines
✍ H. Güsten; L. Klasinc; D. Stefanović 📂 Article 📅 1973 🏛 John Wiley and Sons 🌐 English ⚖ 399 KB

## Abstract The fragmentation of 4‐styrylquinoline (I), 4‐(__p__‐nitrostyryl)‐quinoline (II), 4‐(__p__‐chlorostyryl)‐quinoline (III), 4‐(__p__‐hydroxystyryl)‐quinoline (IV), 4‐(__p__‐methoxystyryl)‐quinoline (V), 4‐(__p__‐dimethylaminostyryl)‐quinoline (VI) and 4‐(__p__‐cyanostyryl)‐quinoline (VII)

The electron impact-induced cyclization
The electron impact-induced cyclization of o-carboxy- and o-carboxamidocyclopropylbenzenes
✍ Albert T. Lebedev; Tatyana N. Alekseeva; Tatyana G. Kutateladze; Sergey S. Mocha 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 398 KB

The isomerization of M + ' of o-carboxy-and o-carboxamidocyclopropylbenzenes into five-and six-membered heterocycles due to the ortho effect has been demonstrated by means of electron impact mass spectra, high-resolution mass spectrometry data and metastable ion spectra. The criteria for the quantit