Zur Reaktivität von Disilylarsenido-Eisenkomplexen gegenüber Carbonsäurechloriden Die ersten Arsaalkenyl- und Diacylarsenidokomplexe. Röntgen-Strukturanalyse von Z-[(η5-C5H5)(CO)2Fe?AsC(OSiMe3)(t-Bu)]

On the Reactivity of Disilylarsenido Iron Complexes towards Carbonyl Chlorides: The First Arsaalkenyl- and Diacylarsenido Complexes. X-Ray Structure Analysis of Z-(η⁵-C₅H₅)(CO)₂Fe? As?C(OSiMe₃)(t-Bu)] The reaction of equimolar amounts of (η⁵-C₅H₅)(CO)₂FeAs(SiMe₃)₂ ( 1a ) with the carbonyl chlorides RC(O)Cl (R = t-Bu, 2,4,6-Me₃C₆H₂ and 2,4,6-t-Bu₃C₆H₂) yields the arsaalkenyl complexes Z-(η⁵-C₅H₅)(CO)₂Fe? As?;C(OSiMe₃)R ( 2–4 )]. The diacylarsenido complexes (η⁵-C₅H₅)(CO)₂Fe? AsC(O)R]₂ ( 5, 6 ) are generated by treatment of 1a with two equivalents of pivaloyl chloride or mesitoyl chloride, respectively. The As?C-double bond length of 2 (1.821(2) Å) was determined by single crystal x-ray analysis.