Complexes 1(R Me, Et) are accessible both thermally and photochemically. The central As6 ring is a regular hexagon with bond lengths between those of As-As single and double bonds. The 1H NMR signals of the cyclopentadienyl Me groups are found at δ ≈ 0; this can be regarded as evidence of a ring-current effect of hexaarsabenzene.
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Scherrer et al. (1989) studied this question.
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