Nucleophilic Acyl Substitutions of Esters with Protic Nucleophiles Mediated by Amphoteric, Oxotitanium, and Vanadyl Species.

Abstract

TiO(acac)2 and VOCl2 are found to be environmentally friendly, water-tolerant, and easily recoverable catalysts. They allow efficient and chemoselective transesterification of methyl and ethyl esters as well as their conversion into amides and thioesters. A wide range of substrates reacts successfully and diverse functional groups are tolerated.

Extraction of stabilizers from polymers: Separation of oligomeric hindered amine light stabilizers and phenolic antioxidants from polyolefins using liquid chromatography and high‐temperature solid‐phase extraction

“…Two signals characteristic for AO1 or AO2 were used for their quantification in the compound. The first of these at 5.07 ppm can be assigned to the hydrogen of the hydroxyl group (A1) and the second one at 4.09 ppm to the hydrogen next to the oxygen of the ester group (A2 [39]), as shown in Figure 4.…”