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Beilstein J. Org. Chem. 2009, 5, No. 25, doi:10.3762/bjoc.5.25
Graphical Abstract
Scheme 1: Photochromism of 2H-chromenes.
Scheme 2: Synthesis of functionalized pyrans from 2-bromo-3H-naphtho[2,1-b]pyrans and 3-bromo-2H-1-benzopyran...
Scheme 3: Synthesis of the 2-bromo-3H-naphtho[2,1-b]pyran 1 and the 3-bromo-2H-1-benzopyrans 2a/b.
Scheme 4: Ring contraction observed during the cyanation approach towards the synthesis of 3.
Scheme 5: Palladium-catalyzed Sonogashira-coupling of 2-bromo-3H-naphtho[2,1-b]pyran 1.
Scheme 6: Palladium-catalyzed cyanation and carbonylation of 3-bromo-2H-1-benzopyrans 2a/b.
Figure 1: Data from time-resolved measurements of compound 5a. a) and b): Results from fs-pump-probe-spectros...