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Is Cycloheptatrienyl Anion Möbius Aromatic? Structure and Frost Circle

The planar conjugated C7H7− model has eight π electrons and an antiaromatic Hückel occupancy. Möbius aromaticity needs a verified orbital twist, not just eight electrons.

Question

Assess whether the cycloheptatrienyl anion is aromatic from the occupancy of its π\pi molecular orbitals. Draw the anion's structure, then justify your assessment with both a polygon-in-circle diagram and a written explanation.

The supplied reaction scheme is deprotonation of cycloheptatriene to C7H7−\mathrm{C_7H_7^-}. Cycloheptatriene is a seven-carbon ring with three alternating double bonds and one CH2\mathrm{CH_2} carbon; that carbon loses a proton.

Supplied scheme redrawn: cycloheptatriene, a seven-membered ring with three double bonds and one CH2 carbon, is deprotonated to C7H7−.

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Evidence boundary

The representative exercise is Question 1 on page 2 of the University of San Diego CHEM 302 exam dated 20 February 2009. Its structure, drawing request and polygon/circle argument are retained. The Frost diagram assumes a regular planar, fully conjugated Hückel ring; it does not establish the isolated anion’s actual geometry or spin state. Möbius aromaticity is an additional clarification, and the cited research intermediate is not identified as the parent anion.