Grazyna Cynkowska

Identification and determination of the glyceride and tris-(2-hydroxyethyl)isocyanurate structures in the average macromolecule of a polyester with carbon-13-NMR spectroscopy : Analysis of the polyester average structure

The 13C-NMR approach to quantitative analysis of a polyester resin synthesized from dimethylterephthalate, ethylene glycol, tris-(2-hydroxyethyl)isocyanurate (THEIC), and glycerol is presented. Various glyceride and isocyanurate structures formed during the esterification have been identified and analyzed, at first in simple model systems and then in the structure of the resin. The contents of particular structural units were determined as well as a hypothetical average macromolecule of the resin defined. The assignments of 13C-NMR signals were made and correlated with the 1H shifts using a 2D-HETCOR experiment.

Reaction of N-benzoyl amino acids with oxalyl chloride: a facile route to 4-substituted 2-phenyloxazole-5-carboxylates

N-benzoyl amino acids 1a–g react with excess oxalyl chloride at room temperature followed by addition of alcohols to afford 4-substituted 2-phenyloxazole-5-carboxylates 3a–g.