Electrospray mass spectrometry studies of macromolecules containing 1,3-oxazolidine moieties.

The polycondensation of terephthalaldehyde with 2-amino-2-methyl-1,3-propanediol using acidic catalysts leads to the formation of linear polymers and macrocyclic compounds with 2-(1',4'-phenylene)-5-methyl-1-aza-3,7-dioxabicyclo[3.3.0]octane as the repeating unit in all compounds. The structure of the polymer was determined by 1H- and 13C-NMR spectroscopy, and electrospray ionization mass spectrometric (ESI-MS) analysis. ESI-MS measurements were used to study the details of the polymer structure and support the equimolar alternating nature of bicyclo-O,N-acetals of terephthaldehyde in these macromolecules.

Electrospray mass spectrometry determination of poly(oxazolidine acetal).

The polycondensation of terephthalaldehyde with 2-amino-2-hydroxymethyl-1,3-propanediol (TRIS), or of terephthaldehyde with 2,2'-(1,4-phenylene)-bis-1,3-(4,4-dihydroxymethyl)oxazolidine (bis-oxazolidine), using acidic catalysts, leads to the formation of linear polymers and macrocyclic compounds. The structure of the polymer was determined by (1)H-, (13)C-NMR spectroscopy and electrospray ionization mass spectrometry (ESI-MS) analysis. ESI-MS measurements were used to study the details of the polymer structure and support the alternating nature of equimolar amounts of oxazolidine and the cyclic acetal of terephthaldehyde in these macromolecules.

UV spectrophotometric investigations of biologically active maleic anhydride copolymers.

UV spectra and absorption coefficients of biologically active copolymers of maleic anhydride with carbohydrates, terpenes and 1,3-dioxane derivatives were measured. The quantitative relationships of absorbance vs concentrations of polymers were determined as well. The possibility of determining the copolymer contamination due to monomers and oligomeric compounds was shown.