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The bis(triphenylarsane) complex of the [P4]2+ dication has been formed in a high-yielding one-pot synthesis. X-ray crystallography reveals a butterfly structure of the bicyclo[1.1.0]-tetraphosphane-1,4-diium core, with two triphenylarsane ligands in an exo,exo configuration (see picture). The reaction of [(Ph3As)2P4]2+ with Ph3P results in the quantitative formation of [(Ph3P)2P4]2+ and Ph3As.
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Donath et al. (2012) studied this question.
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