Inhaltsu È bersicht. Bei der Umsetzung a Èquimolarer Mengen an [(g 5 -C 5 Me 5 )(CO) 2 FeE(SiMe 3 ) 2 ] (1 a: E = P; 1 b: As; 1 c: Sb) mit Diphenylketen werden die g 1 -Phosphaallyl-, g 1 -Arsaallylund g 1 -Stibaallylkomplexe [(g 5 -C 5 Me 5 )(CO) 2 Fe±E(SiMe 3 )-C(OSiMe 3 )=CPh 2 ] (2 a: E = P; 2 b: As; 2 c: Sb) erhalten. Die Moleku È lstukturen von 2 b und 2 c wurden durch Ro È ntgenstrukturanalysen ermittelt.Syntheses and Structures of g 1 -Phosphaallyl, g 1 -Arsaallyl, and g 1 -Stibaallyl Iron Complexes [(g 5 -C 5 Me 5 )(CO) 2 Fe±E(SiMe 3 )C(OSiMe 3 )=CPh 2 ] (E = P, As, Sb)Abstract. The reaction of equimolar amounts of [(g 5 -C 5 Me 5 )(CO) 2 Fe±E(SiMe 3 ) 2 ] (1 a: E = P; 1 b: As; 1 c: Sb) and diphenylketene afforded the g 1 -phosphaallyl-, g 1 -arsaallyl-, and g 1 -stibaallyl complexes [(g 5 -C 5 Me 5 )(CO) 2 Fe±E(SiMe 3 )-C(OSiMe 3 )=CPh 2 ] (2 a: E = P; 2 b: As; 2 c: Sb). The molecu-lar structures of 2 b and 2 c were elucidated by single crystal X-ray analyses.