Synthesis and explosive decomposition of organometallic dehydro[18]annulenes: an access to carbon nanostructures |
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Authors: | Laskoski Matthew Steffen Winfried Morton Jason G M Smith Mark D Bunz Uwe H F |
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Institution: | USC NanoCenter and the Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina 29208, USA. |
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Abstract: | The synthesis of eight new cyclobutadiene or ferrocene-fused organometallic dehydroannulenes is reported. Cadiot-type coupling of a 1-bromoethynyl-2-silylethynylbenzene derivative to an organometallic diyne (1,2-diethynyl-3,4-bis(trimethylsilyl)cyclobutadiene(cyclopentadienyl )cobalt or 1,2-diethynylferrocene) is followed by deprotection and Cu(OAc)(2)-promoted ring closure. Five of the organometallic dehydroannulenes were structurally characterized. Three of the novel cycles explode at temperatures from 196 to 293 degrees C and form insoluble carbon materials. The soot produced from 13a shows a high abundance of onion-like carbon nanostructures. The nanostructures were characterized by high-resolution transmission electron microscopy. |
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