Durch konsekutive Suzuki‐Kupplungen sind aus der Boronsäure 1 1,8‐Diarylnaphthaline wie 2 (A = Acceptor, D = Donor) allgemein zugänglich. Aufgrund nichtkovalenter π‐π‐Wechselwirkungen sind diese deutlich NLO‐aktiver als ihre längerwellig absorbierenden 1,5‐Isomere und damit hochinteressante Alternativen zu den besten klassischen blautransparenten Frequenzverdopplern. magnified image
The first dicyanomethylene analogue 1 [(E/Z) mixture] of a compound containing the fundamental chromophore of thioindigo can be converted consecutively into the valence isomers 2,3, and 4. The two new photochromic systems found (2/1 and 3/4), which are based on the hexatriene/cyclohexadiene conversion, may be of interest for optical information technology.
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