Chromium Complexes with cyclo‐Asx, Ligands The interaction of [(η5C5Me4R)(CO)2Cr]2(Cr≡Cr) (1a: R = CH3 1b: R = C2H5) with yellow arsenic (As4) affords the triarsachromatetrahedranes [(η5‐C5Me4R)(CO)2Cr(η3‐As3)] (2a, b) as well as the 27‐VE triple‐decker complexes [{(η5‐C5Me4R)Cr}2‐(μ,η5‐As5)] (3a, b) 3 is also formed photochemically from 2. 2a and 3b have been characterized by X‐ray structure analyses. The cyclo‐As5 ligand forms a regular arsenic pentagon.
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Scherer et al. (1990) studied this question.
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