Enynes 5a-g were prepared in moderate to good yields from 1-(triphenylphosphoranylideneaminoalkyl)benzotriazoles. Ring-closing metathesis of 5a-f afforded functionalized dienes 6a-f, respectively, which were used in a Diels-Alder cycloaddition reaction in the synthesis of the corresponding hexahydroisoquinoline derivatives 7a-f.
Polyurethanes were prepared from diphenylmethane-4,4`-diisocyanate, poly(tetramethylene ether) glycol, and B, P-containing polyols. The structure and properties of these polyurethanes were studied in relation to the synthesis conditions, including the functional group ratio and temperature. The heat resistance of the polyurethanes was evaluated.
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