On the reaction of azulen-2-ylmethylene(triphenyl)phosphorane. Convenient preparation of azuleno[1,2-f ]- and azuleno[1,2-a]-azulenes and their properties
作者:Tohru Takayasu、Makoto Nitta
DOI:10.1039/a702716h
日期:——
The reaction paths involve the Michael-type addition of 9 onto 10 and 14, subsequent proton migration to regenerate the phosphorane moiety, intramolecular condensation of the formyl and carbonyl groups (Wittig reaction) and aromatization. In order to gain insight into the mechanism, PM3 calculations on compounds 9, 10 and 14 as well as on the related compound, (azulen-2-ylimino)tributylphosphorane,