Synthesis and cyclotrimerization of dipropargyl derivatives of diepoxides (in English)
Dipropargyl derivatives were synthesized from propargyl alkohol and diglycidyl ether of bisphenol A or ethylene glycol. Tris(2-hydroxyethyljamine or 2-methylimidazole was used as a catalyst and the addition was carried out at 60°C, 100°C and 150°C; the best results were obtained at 100°C. The reaction course was controlled by the determination of the epoxy groups content. The propargyl derivatives were made to cyclotrimerize in boiling dioxane, using complex salts as catalysts; the Co2+, Fe3+ and Sn4+ complexes with triethylamine were used. The Co2+ salt gave about 30% of the crosslinked product, which was insoluble and infusible. The residua product was a soluble mixture of oligomers containing double and triple bonds, and a small amount of 1,3,5-trisubstituted benzene rings. The products were investigated by NMR and IR spectrometry. The Sn4+ and Fe3+ salts were less effective than the Co2+ salt as catalyst.
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