Selective Formation and Unusual Reactivity of Tetraarsabicyclo[1.1.0]butane Complexes

摘要: The selective formation of the dinuclear butterfly complexes [{Cp'''Fe(CO)2}2(μ,η(1:1)-E4)] (E = P (1 a), As (1 b)) and [{Cp*Cr(CO)3}2(μ,η(1:1)-E4)] (2 a), (2 b)) as new representatives this rare class compounds was found by reaction E4 with corresponding dimeric carbonyl complexes. Complexes 1 b 2 b are first As4 a bridging coordination mode. Moreover, studies regarding reactivity presented, revealing unprecedented As8 cuneane [{Cp'''Fe(CO)2}2{Cp'''Fe(CO)}2(μ4,η(1:1:2:2)-As8)] (3 b) [{Cp*Cr(CO)3}4(μ4,η(1:1:1:1)-As8)] (4). fully characterized NMR IR spectroscopy well X-ray structure analysis. In addition, DFT calculations give insight into transformation pathway from to structural motif.