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Chromium-Templated Benzannulation of (η5-Cyclohexadienyl)Mn(CO)3-Methoxy-Cr(CO)5 Carbenes

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journal contribution
posted on 22.02.2016, 10:53 by Julien Dubarle-Offner, Françoise Rose-Munch, Karl-Heinz Dötz, Eric Rose, Anne Sophie Cuvier, Armen Panossian
Pentacarbonyl­{methoxy-[1-(η5-4-methoxy-6-phenylcyclohexadienyl)­tricarbonylmanganese]­carbene}­chromium (5) accessible from (η5-1-bromo-4-methoxy-6-phenylcyclohexadienyl)­tricarbonylmanganese (4) and Cr­(CO)6 undergoes a chromium-templated benzannulation with 3-hexyne to give monometallic Cr complex 12 in 60% yield. The key feature of this reaction is the participation of a conjugated double bond of the η5-cyclohexadienyl-Mn moiety in the [3+2+1] benzannulation reaction. The X-ray structure of complex 12 reveals a syn position of the phenyl group with respect to the Cr tripod, supporting the participation of the Mn moiety in the benzannulation process.

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