2,5,7,10‐Tetrakis(trimethylsilyl)‐1,6‐methano[10]annulene, a Fluxional Valence Tautomer with Cyclopolyolefin Structure

Abstract

Nullification of the aromatic structure of 1,6-methano[10]annulene by substitution is observed in the title compound. In solution at room temperature, single and double bonds fluctuate with concomitant mutual change of conformation of the seven-membered rings, whereas in the crystal a valence structure is frozen in.