Alan F. Weston

Boron–sulphur compounds. Part VI. Organoboron compounds of cysteamine (2-aminoethanethiol)

The synthesis and properties of a new class of compounds, based on the –B–S–CH2CH2–NH unit, are described. The reaction of trisalkylthioboranes and cysteamine gave a borazine which on reaction with ethylenediamine gave a novel unsymmetrical borazine. The mass spectral fragmentations of these compounds are fully discussed.

Pseudotropylium and cyclopentadienyl ions in the mass spectra of tri-N-methylborazines

Abstract Ion kinetic energy spectra of a series of tri- N -methylborazines suggest the possible formation of cyclopentadienyl-like ions, by metastable decomposition in the first field free region of a mass spectrometer, from their tropylium-like ions.

Organoboron compounds. Part X. Polycyclic borazines

The synthesis of polycyclic borazines, (BN[CH2]ηX)3(X = O, NH, or NMe; n= 2 or 3) by reaction of a tris-alkylthioborane with a series of hydroxyamines or diamines is described and their i.r. and mass spectra and possible mechanism of formation are discussed.

Organoboron compounds. Part IX. Synthesis and properties of some 2-phenyl-1,3,2-oxazaborolans

The synthesis and properties of some 2-phenyl-1,3,2-oxazaborolans are described and the i.r. spectra and general mass-spectral features of these compounds are discussed.

Stability of triphenylborthiin (PhBS)3

A comparison of the mass spectrum of triphenyl-borthiin with that of 2,4,6-triphenyl-1,3,5-trithian shows triphenylborthiin to have considerable stability which could possibly be due to charge delocalisation the borthiin ring.

Gaseous bivalent borenium cations

A mass spectral study of a series of heterocyclic organoborarnes shows that when the exocyclic group attached to boron is either an amino- or an alkylthio-group then the cyclic borenium ion can have considerable stability.

Boratropylium and boracyclopentadienyl ions in the mass spectra of aminoboranes

Acyclic and cyclic derivatives of organoboranes, containing at least one boron–nitrogen bond, give peaks in their mass spectra assignable to the boratropylium and boracyclopentadienyl ions.