Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Mesitylcopper(I), is researched, Molecular C9H11Cu, CAS is 75732-01-3, about Splitting dioxygen with mesitylcopper(I). An arylcopper(I) intermediate, formed in a coupling reaction, containing two trapped trigonal pyramidally coordinated oxides.Safety of Mesitylcopper(I).
Oxidatively induced reductive coupling of mesityl from mesitylcopper(I) effected by dioxygen is shown to result in an intermediate, [Cu10O2(Mes)6], containing oxide ligands trapped in an unusual coordination mode on the surface of the cluster. [Cu10O2(Mes)6] was characterized by x-ray crystallog. The complex has approx. D3h symmetry such that the two oxide ligands and a central copper(I) are situated on the approx. 3-fold axis while the remaining nine copper(I) centers form three wings, each with three copper(I) atoms participating in 2 electron-3 center bonds with two mesityl groups. Cu···Cu distances involved in the latter interactions range from 2.376(8) to 2.439(6) Å. The oxide ligands are trigonal pyramidally coordinated by four copper(I) atoms at distances of 1.81(2)-1.90(2) Å and are slightly displaced (0.1 Å) from the cluster surface, i.e. from the trigonal coordination plane, toward the central cooper(I). The unusual coordination mode of oxygen on the surface of the cluster, the extreme instability of the complex, and its color are discussed in the context of extended Hueckel (EHT) calculations
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Reference:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com