SunzmaryThe charge-delocalized cation (1) has been IN view of the interest1s2 shown in the recent experimental work on the (CH) 2 specie^,^ we record the preparation of the cation (l), structurally related to cation (2).3asbA reasonable precursor for cation (1) is compound (3). The reported synthesis4 o f (3) is multi-step and of low generated from two precursors which have been prepared via unique double bond participation of a cyclopropyl cation in solvolysis.

Properties of the [4]Annulene System. Induced Paramagnetic Ring Current Sir:Recent remarkable achievements in annulene1 chemistry are, undoubtedly, the spectral characterization of [4]annulene (cyclobutadiene) (1) detained in a matrix at low temperatures2-6 and the isolation of its derivail) This term is defined by F. Sondheimer and R. Wolovsky, J. Amer.

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