Primary normal alkylammonium halides crystallize in a preferred crystallographic orientation, forming single or twinned layers. The basal spacings are related to the number of carbon atoms within the homologous series, and are doubled in the twin layers. The orientation of the hydrocarbon chains between the ionic heads is discussed.
The direct alkylation of n-butane by larger alkanes in HF-TaF5 has been demonstrated. Evidence for the analogous direct alkylation of propane has been presented but the data are not conclusive. A general mechanism has been elucidated for this alkane alkylation reaction.
In einem Hastelloy‐C‐Rührautoklaven werden unter Stickstoff Tantal(V)‐fluorid, Fluorwasserstoff und Isobutan unter 17,5 bar Wasserstoff auf 40°C erwärmt, und unter Rühren werden n‐Heptan, n‐Octan bzw. ein Gemisch von C7‐1 1‐Alkanen eingeleitet.
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