Halocyclopentadienyl Complexes of Manganese and Rhodium

Submitted by KENNETH J. RE1MER and ALAN SHAVERt Checked by MICHAEL H. QUICK and ROBERT J. ANGEL1C1  

Halocyclopentadienyl complexes are very useful starting materials for the synthesis of other substituted compounds. Until recently, the compounds Mn(i)s-C5H4X)(CO)3 (X = C1, Br, I) were obtained in low yield by means of multi-step synthetic procedures.1 As a result, they were not suitable as synthetic intermediates. The method described here supplies these compounds easily and in high yield by means of the insertion of 5-diazo-l,3-cyclopentadiene2 into the manganese-halogen bond of MnX(CO)s (X = Cl, Br, I). The preparations of some halocyclopentadienyl rhodium complexes are also described. 

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