The E isomer of a [5]cumulene derivative, 2,2, 9,9-tetramethyl-3,8-diphenyldeca-3,4,5,6,7-pentaene (1), which was previously believed to be unisolable owing to very fast E/Z isomerization, was isolated and structurally characterized. The Z isomer was trapped as the transition-metal complex 5, and the molecular structure was determined. DFT calculations and an electrochemical study on 1 are also described.
Toda, Fumio; Tanaka, Koichi; Nawata, Hidetoshi, Journal of the Chemical Society. Perkin transactions I, 1994, # 15, p. 2043 - 2044