Synthese von Diaza[4.4]spirenen
2014
Dürr, Heinz | Schrader, Lutz
The synthesis of substituted diaza [4.4] spirenes (3) by 1.3-dipolar addition of diazo-cyclopentadienes to alkynes is described. If the 1- or 4-position of the diazo-cyclopentadienes contains an H-atom, bicyclic pyridazine derivatives are formed with alkynes. The uv-spectra of the diaza [4.4] spirenes (3) are discussed with regard to the new term “spiroconjugation”.
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