All-Carbon Molecules: Evidence for the Generation of Cyclo[18]carbon from a Stable Organic Precursor.
作者： F. DIEDERICH , Y. RUBIN , C. B. KNOBLER , R. L. WHETTEN , K. E. SCHRIVER
DOI: 10.1126/SCIENCE.245.4922.1088
关键词:
摘要: The unambiguous structural characterization of a single-sized all-carbon molecule requires its chemical synthesis. For cyclo[18]carbon, ab initio calculations predict relatively stable, cyclic D9h ground state geometry with alternating C-C (1.36 angstroms) and C identical withC (1.20 bonds. synthesis x-ray crystal structure direct precursor to C(18) are described. analysis laser flash heating experiments on this by time-of-flight mass spectroscopy shows sequence retro-Diels-Alder reactions leading as the predominant fragmentation pattern. Structural evidence is provided for generation an from well-characterized organic precursor.
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