Synthesis and Structure of Metal‐Functionalized Phosphaarsiranes

Reaction of (η 5 ‐C 5 Me 5 )(CO) 2 FeAs(SiMe 3 ) 2 ( 1 ) with equimolar amounts of (bis(trimethylsilyl)methylene]chlorophosphane afforded the 1‐metallo‐1‐arsa‐2‐phosphapropene (η 5 ‐C 5 ‐Me 5 )(CO) 2 FeAs(SiMe 3 )P=C(SiMe 3 ) 2 ( 2 ) in addition to a few crystals of dimetallophosphaarsirane (η 5 ‐C 5 Me 5 )(CO) 2 Fe‐ AsC(SiMe 3 ) 2 PFe(CO) 2 (η 5 ‐C 5 Me 5 ) ( 3 ). Treatment of 2 with an excess of [( Z )‐cyclooctene]Cr(CO) 5 and subsequent chromatography furnished the phosphaarsirane‐[Cr(CO) 5 ] adduct (η 5 ‐C 5 Me 5 )(CO) 2 Fe‐ηAsC(SiMe 3 ) 2 PH[Cr(CO) 5 ] ( 5 ). The molecular structures of 3 and 5 were established by single‐crystal X‐ray structure analyses.