Abstract
AbstractThe cover picture shows the photochemical cyclization of silyl‐substituted trans‐1,2‐bis(benzodithiophen‐2‐yl)ethenes into the corresponding silylated helicenes and the transformation of these into new halogenated helicenes. The picture underlines a peculiar aspect of the paper, that is, the high solubility of the above silylated trans alkenes, which is a consequence of the presence of the two silyl groups and results in a very fast and easy photocyclization that can be perfomed in solution by using a glass reactor with an immersion Hg lamp. The molecular packing of the trans alkenes in solution shows a long interplanar distance between two molecules, which accounts for its high solubility. The work is a collaboration between Milan and Parma Universities, whose Cathedrals are shown. Details are discussed in the article by E. Licandro et al. on p. 4499 ff.
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