Synthesis and Properties of the Tridecafulvene Derivatives. The Substituent Effect at the 14-Position on the Tropicity of Thirteen-Membered Fulvene System
Synthesis and Properties of the Tridecafulvene Derivatives. The Substituent Effect at the 14-Position on the Tropicity of Thirteen-Membered Fulvene System
Synthesis and Properties of Extended Tridecafulvenes. The Substituent Effect on the Paratropicity of This Fulvene System as a Measure of Polarizability
10-dimethyl-6,8-bisdehydrotridecafulvene have been synthesized and the effect of increasing exocyclic double bonds upon the paratropicity of the thirteen-membered ring is discussed by comparing the polarizability of 2,2-dicyanovinyl, 4,4-dicyano-1,3-butadienyl, and 6,6-dicyano-1,3,5-hexatrienyl groups.
The first example of fuluvalene derivative containing two monocyclic large-membered rings, 1-(5,10-dimethyl-6,7,8,9-tetradehydrocyclotridecen-1-ylidene)-7,12-dimethyl-8,9,10,11-tetradehydrocyclopentadecene, has been synthesized. Examination of 1H and 13C NMR spectra indicates that the tridecapentadecafulvalene derivative shows no ring current effect but polyolefinic character.