121434-35-3Relevant academic research and scientific papers
A new class of azobenzene chelators for Mg2+ and Ca 2+ in buffer at physiological pH
Momotake, Atsuya,Arai, Tatsuo
, p. 7277 - 7280 (2003)
A new class of azobenzene-based chelators, trans-3a and trans-3b (3a and 3b), were designed and synthesized in two steps. Both 3a and 3b were readily dissolved in a buffer solution at physiological pH. The values of the dissociation constant of 3a and 3b for Mg2+ and Ca2+ were determined by the Hills plot; KdMg=1.12 mM and K dCa=660 μM for 3a and KdMg=158 μM and KdCa=200 μM for 3b, respectively. On irradiation at 489 nm light, 3a isomerized to give cis-form, which underwent cis-to-trans thermal isomerization in darkness at room temperature. The change in the absorption spectrum of the irradiated solution of 3a in the presence of Mg2+, showing the cis-to-trans thermal isomerization, indicates that the affinity of cis-3a for Mg2+ is lower than that of 3a.
Reactivity of Phenyliodonium Bis(aryl- or alkyl-sulphonyl)methylides towards Thiobenzophenones
Hatjiarapoglou, Lazaros,Varvoglis, Anastassios
, p. 379 - 382 (2007/10/02)
Thermal reactions of several phenyliodonium bis(aryl or alkyl-sulphonyl)methylides with some thiobenzophenones are described. 4,4'-Dimethoxythiobenzophenone affords exclusively 2-arylsulphonyl-3-(4-methoxyphenyl)-6-methoxybenzothiophenes, whereas other thiobenzophenones may give also gem-bis(arylsulphonyl)thiiranes and in one case an unsaturated gem-disulphone.Some oxidation reactions of an ylide with various substrates occur either thermally or photochemically.
