The introduction of alkynyl groups into the 2,3-positions of developing NIR chromophores. The electron absorption properties of differentially N,NЈ-disubstituted dialkynyl the 1,4-diazabuta-1,3-diene (DAD) backbone succeeds along two complementary synthetic routes either by condensing DADs gave no i
✦ LIBER ✦
Synthesis and Properties of 2,3-Dialkynyl-1,4-benzoquinones
✍ Scribed by Peter Hammershøj; Theis K. Reenberg; Michael Pittelkow; Christian B. Nielsen; Ole Hammerich; Jørn B. Christensen
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 195 KB
- Volume
- 2006
- Category
- Article
- ISSN
- 1434-193X
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The 2,5-bisacrylate-substituted 1,4-benzoquinone bisketal 7a was synthesized by electrochemical oxidation of the corresponding dimethoxybenzene 6. The methyl ester 7a was transesterified to the corresponding ethyl, n-propyl and isopropyl esters 7bϪ7d by Ti(OEt) 4 catalysis and to the corresponding n