✍ Scribed by Roger F. C. Brown
No coin nor oath required. For personal study only.
The discovery of the equilibration of alkynes with exocyclic carbenes has provided a further pathway for the transformation of polycyclic aromatic systems into less ylidenecarbenes at high temperatures has been followed by increasing use of the reactivity of such carbenes in the accessible cyclopenta-fused hydrocarbons. Some recent developments in the chemistry of aryl radicals have extended synthesis of polycyclic aromatic hydrocarbons. This has led to simple and elegant syntheses of fullerene fragments, and the scope of radical approaches to the synthesis of polycyclic hydrocarbons. of cyclopenta-fused hydrocarbons. The related hightemperature equilibration of arynes with ring-contracted precursors of arynes and aryl radicals. The coverage of re-
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## Abstract An unprecedented alkyne–nitrile metathesis takes place when the high‐valent iron‐nitrido dication [Fe(L)N]^2+^, with L=2,6‐bis(2‐methyl‐1,3‐diaminopropan‐2‐yl)pyridine, is reacted with alkynes in the gas phase under thermal conditions. While the detailed role of the alkyne substrate wit