63237-84-3Relevant articles and documents
Novel bipyrazolo[1,5-: A] pyridine luminogens with aggregation-induced emission enhancement properties
Hsiao, Pu-Yen,Chu, Jean-Ho
supporting information, p. 12281 - 12284 (2021/11/30)
A novel 3,3′-bipyrazolo[1,5-a]pyridine molecular scaffold was obtained as a product of serendipity. Both photophysical characterisations and HOMO-LUMO theoretical calculations indicate its potential as a promising fluorophore with notable intramolecular charge transfer. Nonetheless, the emission properties of this compound suffer from the typical aggregation-caused quenching effect. To overcome this situation, we introduced additional diaryl groups onto the skeleton and synthesised a series of 7,7′-diaryl-3,3′-bipyrazolo[1,5-a]pyridines via palladium-catalysed intermolecular C-H/C-H bond cross-coupling reaction in 35-62% yields. This series of tailor-made luminogens with twisted π-structures display aggregation-induced emission enhancement properties.
Unexpected cleavage of the Cpy-Cpybond in the reaction of 2,2′-bipyridine N,N′-diimines with acetylenes
Supranovich, Vyacheslav I.,Borodkin, Gennady I.,Vorob'Ev, Aleksey Yu.,Shubin, Vyacheslav G.
supporting information, p. 5377 - 5380 (2015/02/02)
An unusual cleavage of the Cpy-Cpybond in the reaction of 2,2′-bipyridine N,N′-diimine and its C-methyl substituted derivatives with acetylenes is described. The effect of the solvent on the yield of 7,7′-bipyrazolo[1,5-a]pyridine-2,2′,3,3′-tetracarboxylates and the products of cleavage of the Cpy-Cpybond has been studied. The mechanism of the cleavage reaction is discussed on the basis of DFT calculations.
