Bei der Reaktion äquimolarer Mengen (η5‐C5H5)(CO)2FeAs(SiMe3)2 (1a) mit den Carbonsäurehalogeniden RC(O)Cl (R = t‐Bu, 2,4,6‐Me3C6H2 und 2,4,6‐t‐Bu3C6H2) werden die Arsaalkenylkomplexe Z‐[(η5‐C5H5)(CO)2FeAsC(OSiMe3)R (2—4)] gebildet. Die Umsetzung von 1a mit zwei Äquivalenten Pivaloylchlorid oder 2,4,6‐Trimethylbenzoylchlorid liefert die Diacylarsenidokomplexe (η5‐C5H5)(CO)2FeAs[C(O)R]2 (5, 6). Durch Röntgen‐Strukturanalyse an kristallinem 2 wurde die darin vorliegende AsC‐Doppelbindung zu 1,821(2) Å bestimmt.
Upon cooling a saturated solution of l a in TMEDA we obtained yellow crystals that were suitable for a n X-ray structure analy~is."~ Figure 1 shows that the crystals contain k , bicyclo[3.2.l]octa-2,6-dienyllithium stabilized by one molecule TMEDA. l c is a monomer with a crystallographic symmetry (C,) which is lower than expected for l a alone (C,) because N1-N2 is not parallel to Cl-CS. Li-Angew. Chem I n [ . Ed. Engl. 25 (1986) No. 5 0 VCH Verlagsgesellschufr
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