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1 article(s) from Cordes, Thorben

Synthesis of novel photochromic pyrans via palladium- mediated reactions

Christoph Böttcher,
Gehad Zeyat,
Saleh A. Ahmed,
Elisabeth Irran,
Thorben Cordes,
Cord Elsner,
Wolfgang Zinth and
Karola Rueck-Braun

Beilstein J. Org. Chem. 2009, 5, No. 25, doi:10.3762/bjoc.5.25

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Scheme 1: Photochromism of 2H-chromenes.

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Scheme 2: Synthesis of functionalized pyrans from 2-bromo-3H-naphtho[2,1-b]pyrans and 3-bromo-2H-1-benzopyran...

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Scheme 3: Synthesis of the 2-bromo-3H-naphtho[2,1-b]pyran 1 and the 3-bromo-2H-1-benzopyrans 2a/b.

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Scheme 4: Ring contraction observed during the cyanation approach towards the synthesis of 3.

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Scheme 5: Palladium-catalyzed Sonogashira-coupling of 2-bromo-3H-naphtho[2,1-b]pyran 1.

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Scheme 6: Palladium-catalyzed cyanation and carbonylation of 3-bromo-2H-1-benzopyrans 2a/b.

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Figure 1: Data from time-resolved measurements of compound 5a. a) and b): Results from fs-pump-probe-spectros...

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Published 27 May 2009

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