The phosphorus- and arsenic-containing small ring compounds 3–5 are formed in the reaction between the bis(trimethylsilyl)phosphido complex 1 and the aryldichloroarsane 2. The X-ray structural analysis of 3 affords the first structural parameters for a diphosphaarsirane derivative; however, the values are by no means exceptional ([Fe] = (C5Me5)(CO)2Fe; Aryl = 2,4,6-tBu3C6H2).
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