Survival of ring currents in planar monocycles subject to [2 + 2] addition of one, two, three, etc., even-carbon polyene clamping groups is governed by a parity rule. If addition is across positions (i1,i1 + 1), (i2,i2 + 1),…,(ij,ij + 1) for clamps 1, 2,…,j, then, if any of i1,i2,…,ij is odd, current is quenched in the central ring; if all of i1,i2,…,ij are even, the central ring current survives.
A. Soncini, P. W. Fowler and L. W. Jenneskens, Phys. Chem. Chem. Phys., 2004, 6, 4921 DOI: 10.1039/B414024A
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