Borane adducts of punicine and of its dehydroxy derivatives (pyridinium-1-yl)-2- and 3-phenolates

Stabilities of bis(thienyl)ethenes in polymethyl methacrylate (PMMA) coatings as absorbance modulation layers for nanoscale imaging

“…2 Cis – trans isomerism cause the photochromism of azobenzenes 2 , 3 and light-induced redox reactions form radical cations and radical anions of photochromic punicines 3 . 4…”

Lithium aluminate flotation by pH- and light-switchable collectors based on the natural product punicine

“… 24 The σ-, π- and chemical properties of the two tautomers 1 +/− A and 1 +/− B, however, are different. As example, electron-deficient boron compounds such as B(C 6 F 5 ) 3 selectively form adducts to the 2-olate group of tautomer 1 +/− A, 32 and cycloadditions with diethyl diazodicarboxylate (DEAD) as electron-deficient dienophile also start from this position. 25 On tautomerization, the olate and hydroxyl group change their roles as hydrogen bond donors and acceptors.…”

In Situ Hydrophobization of Lithium Aluminate Particles for Flotations by Dry Grinding in the Presence of Punicines

“…It was later investigated in more detail with regard to its properties by the Schmidt group, especially its structure as a function of pH [52]. It is easily, cost-effectively and abundantly accessible through simple syntheses [53][54][55]. Punicine combines an electron-poor (pyridinium) and an electron-rich aromatic compound (hydroquinone) in its cationic, i.e., completely protonated, form.…”