@article{oai:soar-ir.repo.nii.ac.jp:00011735,
 author = {Shoji,  Taku and Ito,  Shunji and Okujima,  Tetsuo and Morita,  Noboru},
 issue = {41},
 journal = {ORGANIC & BIOMOLECULAR CHEMISTRY},
 month = {Jan},
 note = {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., Article, ORGANIC & BIOMOLECULAR CHEMISTRY. 10(41):8308-8313 (2012)},
 pages = {8308--8313},
 title = {Synthesis of push-pull chromophores by the sequential [2+2] cycloaddition of 1-azulenylbutadiynes with tetracyanoethylene and tetrathiafulvalene},
 volume = {10},
 year = {2012}
}