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.…”

Demulsification of Heavy Petroleum Emulsion Using Pyridinium Ionic Liquids with Distinct Anion Branching

“…ILs are highly preferred to other chemical demulsifiers because of their unique characteristics, such as moderate ionic conductivity, lower vapor pressure, high chemical stability, and lower flammability . Numerous studies elucidating the effectiveness of ILs for demulsification activity of water/oil separation have been reported in the literature. − Pyridinium is a new class of ILs with unique features and has been tested for many scientific applications. − Specifically, pyridinium ILs are attracting considerable attention as demulsifying chemicals for stable emulsions. Recently, Atta et al synthesized novel geminal dicationic ILs composed of pyridinium and imidazolium cations for the purpose of demulsifying heavy emulsions produced from seawater and crude oil.…”