We describe the synthesis of characterizable diazaheptacene derivatives. Diazaheptacenes need four silylethynyl protecting groups to be isolable. TIPS-ethynyl groups are not bulky enough to allow stabilization. Four Si(sec-Bu)(3)-ethynyl groups symmetrically attached to the acene core sufficiently protect the formed diazaheptacene from dimerization through Diels-Alder reaction. It was characterized by NMR and UV-vis spectroscopies and cyclic voltammetry.
Synthesis and Optical Properties of Dioxolane-Functionalized Hexacenes and Heptacenes
作者:Matthew J. Bruzek、John E. Anthony
DOI:10.1021/ol501373s
日期:2014.7.3
The synthesis of dioxolane-functionalized hexacenes and heptacenes is reported. While heptacenes were too reactive to be successfully isolated, hexacenes showed higher stability and characteristic long-wavelength fluorescence both in solution and in the solid state as crystalline powders.
作者:Matthias Müller、Elias C. Rüdiger、Silke Koser、Olena Tverskoy、Frank Rominger、Felix Hinkel、Jan Freudenberg、Uwe H. F. Bunz
DOI:10.1002/chem.201801079
日期:2018.6.7
The synthesis of bisalkynylated derivatives of tetrabenzo[a,c,p,r]heptacene and tetrabenzo[a,c,l,n]pentacene via two‐/fourfold Stille reactions involving a 9‐stannafluorene and suitable tetrabromoacenes is reported. These triphenylene‐“winged” heptacenes are surprisingly stable and maintain a significant portion of the electronic properties of heptacenes.