116. S. Motallebi, P. Müller,
     “Formation of (6-alkylidene-η⁵-cyclohexadienyl)iron complexes by rhodium-catalyzed carbenoid reactions”
     Organometallics 1993, 12, 4668-4672.

Reaction of ethyl lithiodiazoacetate with the cationic [Fe(arene)Cp] complexes 1 and 2 produces σ-adducts 6 and 7. Upon treatment with a catalytic amount of Rh₂(OAc)₄ in CH₂Cl₂, the adducts are transformed to metallocarbenes, which react further by 1,2- hydrogen migration. While reaction of 6 results in a mixture of equilibrating E and Z stereoisomers 8 and 9, a single product (10) is obtained from 7.

DOI : 10.1021/om00035a063 

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