𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Electron impact induced fragmentation of β-allenic and γ-acetylenic alcohols

✍ Scribed by Siméon Arseniyadis; André Maquestiau; Robert Flammang; Pierre Guenot; Robert Carrié

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
601 KB
Volume
24
Category
Article
ISSN
1076-5174

No coin nor oath required. For personal study only.

✦ Synopsis

The main fragmentation pathway of ionized hydroxyallenes (1) consists of a methyl loss. Extensive deuteriumlabelling experiments indicate that the terminal allenic carbon is implied in this fragmentation. Collisional activation spectra indicate a propenyl-acylium structure (a) for these [M -CHJ+ ions which can originate from a 1,6hydroxyl migration followed by hydrogen rearrangements. Isomeric hydroxyacetylenes (2) behave similarly, also giving rise, by methyl loss, to acylium ions u. It is proposed that 2" is irreversibly isomerized into 1+' by a 1,fhydrogen transfer 'catalysed' by the hydroxy group. The proposed internal proton-bound complex justifies also the easier loss of water from 2+'. Ethyl loss is also a prominent fragmentation for the hydroxyallene and hydroxyacetylene homologues. k Scheme 2

📜 SIMILAR VOLUMES

Electron impact-induced fragmentation of
Electron impact-induced fragmentation of some aminonitropyridines
✍ Ryszard Gawinecki; Danuta Rasała 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 369 KB

The fragmentation behaviour of 18 vicinally substituted aminonitropyridines was studied under electron impact conditions. The decomposition patterns were found to be strongly dependent on the position of substituents The formation of the am analogue of carbazole seems phenylamioopyridine.

The electron impact-induced fragmentatio
The electron impact-induced fragmentation of perchlorylbenzene
✍ Angelo G. Giumanini; Bruno Lunelli 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 English ⚖ 284 KB

The modes of fragmentation of perchlorylbenzene (C6H6C10s) and its perdeutero derivative under electron impact are reported and discussed. The occurrence of the [C,H,O]and [C,H,O]+ ions is accounted for in terms of a novel phenyl migration from chlorine to oxygen.

The electron-impact-induced fragmentatio
The electron-impact-induced fragmentation of acridine
✍ R. M. Acheson; R. T. Aplin; R. G. Bolton 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 393 KB

## Abstract Studies of both high and low resolution spectra, and of metastable decompositions occurring in both the first and second field‐free regions of the mass spectrometer have led to a postulated scheme for the fragmentation of acridine under electron‐impact. There is no specific loss of labe