title: Synthesis of push-pull chromophores by the sequential [2 + 2] cycloaddition of 1-azulenylbutadiynes with tetracyanoethylene and tetrathiafulvalene.
abstract: Azulene-substituted butadiynes have been prepared by Cu-mediated cross- and homo-coupling reactions. The azulene-substituted butadiynes reacted with tetracyanoethylene in a formal [2 + 2] cycloaddition reaction to afford the corresponding 1,1,4,4-tetracyanobutadiene chromophores, in excellent yields. Further [2 + 2] cycloaddition with TTF and TCNE gave novel donor-acceptor chromophores and novel azulene-substituted 6,6-dicyanofulvene derivatives.
authors.affiliation: Department of Chemistry, Faculty School of Science, Shinshu University, Matsumoto, Japan. tshoji@shinshu-u.ac.jp
authors.forename: Taku
authors.initials: T
authors.lastname: Shoji
authors.forename: Shunji
authors.initials: S
authors.lastname: Ito
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Okujima
authors.forename: Noboru
authors.initials: N
authors.lastname: Morita