Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 2159 - 2172 (1989)
Update date:2022-08-29
Topics:
Brown, Ronald
Kemball, Charles
A comparison has been made of the exchange reactions with deuterium of 2,2-dimethylpropane (DMP), 2,2,3,3-tetramethylbutane (TMB) and 2,2,4,4-tetramethylpentane (TMP) over supported catalysts containing iridium, palladium, platinum or rhodium at temperatures in the neighbourhood of 400 K.Reactions were followed mass-spectrometrically and products were also examined by deuterium n.m.r. spectroscopy.Four processes or mechanisms were found to contribute to different extents with the various hydrocarbon-metal systems.These were (I) stepwise exchange, (II) methyl-group exchange, and more general multiple exchange involving (III) αγ-diadsorbed or (IV) αδ-diadsorbed intermediates.Some isomerisation of TMP was observed to occur simultaneously with exchange with the TMP-rhodium system.
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