Cover Picture: Synthesis of Phenylacetylene Dendrimers Having Sterically Congested Diazo Units and Characterization of Their Photoproducts (Eur. J. Org. Chem. 14/2004)

• Published in: European journal of organic chemistry Vol. 2004; no. 14; p. 2949
• Main Authors: Itoh, Tetsuji, Maemura, Toshiyuki, Ohtsuka, Yusuke, Ikari, Yoshiyuki, Wildt, Holger, Hirai, Katsuyuki, Tomioka, Hideo
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01-07-2004; WILEY‐VCH Verlag
• ISSN: 1434-193X; 1099-0690
• DOI: 10.1002/ejoc.200490028

The cover picture shows a phenylacetylene dendrimer having 12 diazo units, from which a dodecakiscarbene is generated. Diazo functional groups are usually labile and hence cannot be used as building blocks to prepare more complicated poly(diazo) compounds. We have shown that a diphenyldiazomethane prepared to generate a persistent triplet diphenylcarbene is also stable and can be used as a building block to construct poly(diazo) compounds, which can generate high‐spin polycarbenes. Details are discussed in the article by H. Tomioka et al. on page 2991 ff.