Zobrazeno 1 - 10
of 60
pro vyhledávání: '"D. M. Brouwer"'
Autor:
D. M. Brouwer, J. A. Van Doorn
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 89:88-96
Protonation of 9-ethyl-10-methylanthracene in HF or CF3COOH/H2O · BF3 affords a mixture of the 9H+- and 10H+-9-ethyl-10-methylanthracenium ions. These ions differ in free energy by only 0.9-1.0 kcal · mole−1. This small difference in stability, w
Autor:
D. M. Brouwer
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 88:9-12
Autor:
J. A. Van Doorn, D. M. Brouwer
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 89:333-352
A detailed investigation has been made of the reversible rearrangement of the 1,2,3,4,5-pentamethylcyclopentenyl ion (1) to the 1,2,3,4,4-pentamethylcyclopentenyl ion (3). In 5: 1 FSO3H-SbF5 this reaction proceeds entirely intramolecularly by 1,2-hyd
Autor:
D. M. Brouwer
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 87:335-341
2-Fluoro-, chloro- and bromomesitylenes, and 5-fluoro-, chloro- and bromo-m-xylenes have been found to form stable benzenium ions in HF-SbF5. The cations give well-resolved PMR spectra, from which their structures have been derived. The 2-halomesityl
Autor:
D. M. Brouwer, J. A. Van Doorn
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 90:535-548
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 94:198-203
The cyclization of hydroxyallyl ions (protonated 3-alken-2-ones) to tetrahydrofuryl ions in a series of strong acids (HF, H2SO4, FSO3H) and superacids (FSO3HSbF5, HFSbF5) has been studied, together with some related reactions. The rates of cyclizatio
Autor:
J. A. Van Doorn, D. M. Brouwer
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 88:573-576
Autor:
D. M. Brouwer
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 86:879-892
Proton magnetic resonance spectra of eight protonated dialkylketones (dialkylhydroxycarbonium ions) have been measured in HF - SbF5. Due to restricted rotation about the partially double C - O bond, which leads to synanti isomerism, symmetric ketones
Autor:
D. M. Brouwer
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 87:342-348
A number of halotoluenes and halobenzenes have been found to give stable benzenium ions in HF-SbF5. The PMR spectra of these ions are reported. A mixture of all three possible stable cations was obtained with m-chloro- and m-bromotoluenes; of m-fluor
Autor:
D. M. Brouwer, A. A. Kiffen
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 92:1053-1056
The most stable conformations of some protonated tertiary carboxylic acids in HF-BF3 and HF-SbF5 have been shown to be those which have one OH proton syn and the other anti to the alkyl groups. In HF solutions, the intramolecular interconversions bet