Reactions carried out both in protic and aprotic water-miscible solvents can be affected by the presence of water. We have recently discovered that luminescence intensity a methanolic solution Tb(III) containing salicylic acid Tb�SA is highly sensitive to water content. The water-induced quenching was utilized for accurate measurement content methanol, ethanol, acetonitrile, tetrahydrofuran 0...

A set of hierarchical beta zeolites with variable Si/Al ratios, nanoparticle sizes, textural and acidic properties was prepared using a hydrothermal treatment concentrated alkali metal-free protic acid-containing zeolite gel-precursor. The obtained catalysts were investigated in the Prins cyclization isovaleraldehyde isoprenol yielding commercially valuable tetrahydropyranol (Florol). highest y...

4,4'-Dimethoxytrityl, (DMTr), is at present commonly used for the protection of the 5'-terminal hydroxy function in solid phase DNA or RNA synthesis. During the oligonucleotide synthesis the first step, prior to coupling with the appropriately protected phosphoroamidite monomer, is the removal of the 5'-protecting group, (DMTr, detritylation) by a suitable protic acid. Strong protic acids, such...

A ruthenium polypyridine complex [Ru(phen)(2)(IPBA)](PF(6))(2) (complex 1) (IPBA = 4-(1H-imidazo[4,5-f][1,9]phenanthroline-2-yl)benzaldehyde), which displays environment-responsive dual emissive properties, was designed and synthesized. In aprotic solvent, such as DMSO, DMF or CH(3)CN, the complex emits strong cyan light. When in protic solvent, it emits orange light. Similarly, the response of...

Effect of the basic property of reactants (tertiary amine catalysts, a substrate amine, and acid neutralizers) on catalytic dehydrocondensation between a carboxylic acid and an amine by using 2-chloro-4,6-dimethoxy-1,3,5-triazine (CDMT) was studied. The reaction yield was affected by the acid-base equilibrium among reactants. In dichloromethane, a representative aprotic solvent, a strongly basi...

Three novel compounds, named the aselacins, which inhibit the binding of endothelin to its receptor have been isolated from two related Acremonium species of fungi grown in stationary culture. These compounds are cyclic pentapeptolides with a ring formed by cyclo[Gly-D-Ser-D-Trp-beta-Ala-L-Thr] and an additional exocyclic D-Gln to which is attached a functionalized long chain fatty acid. The as...

Icosahedral carborane anions such as CHB11Cl11- are amongst the least coordinating, most chemically inert anions known. They are also amongst the least basic, so their conjugate acids, H(carborane), are superacids (i.e. stronger than 100% H2SO4). Acidity scale measurements indicate that H(CHB11Cl11) is the strongest pure Brønsted acid presently known, surpassing triflic and fluorosulfuric acid....

This work presents the pH sensing ability of a fluorescent indolin‐3‐imine derivative. Protonation weakly basic imine (pKa = 8.3 its conjugate acid) results in significant redshift absorption band. The fluorophore acts as photobase, with basicity increase approximately 6 units upon photoexcitation. behavior promotes excited state proton transfer from weak acids such protic solvents. characteris...

In an inorganic material, a measure of the Lewis basicity of a solvent is commonly provided by the optical basicity, i.e. the ability of the solvent molecules to donate their electrons to an acidic species. This quantity is known to vary with the polarizability of the Lewis base. In protic solvents, the Lewis definition of basicity is barely used; it is replaced by the more purpose-built Brønst...