Primary and secondary cyclobutylmethyl cations were found to be elusive in superacidic media even at low temperatures. They give thermodynamically more stable rearrangement products, i.e., the dimeric bicyclo[4.4.0]dec-l-yl cation and substituted cyclopentyl cations, respectively. In the search for a persistent cyclobutylmethyl cation, the more stabilized cyclobutyldicyclopropylmethyl cation was prepared from its corresponding alcohol in FSO3H/SO2ClF at -90 degrees C. Using variable-temperature C-13 NMR studies and theoretical calculations, the ion was shown to exist preferentially in its bisected conformation at -80 degrees C. The ion is predominantly classical, with expected significant delocalization into the neighboring cycloalkyl rings.