| Abstract
| - Polyethers with the allenyl side chains were synthesized by the simultaneous acid-catalyzedreaction of dialdehydes 1, alkylene bis(trimethylsilyl) ethers 2, and 1-trimethylsilyl-2-butyne (4b). Beforepolymerization, Lewis acid-catalyzed three-component reactions of aldehydes, alkoxysilanes, and propargylsilanes were studied to find that 4b was effective as an allenyl reagent in this reaction. Thepolycondensations of 1, 2, and 4b were carried out in the presence of 10 mol % of triphenylmethylperchlorate (TrClO4) at −50 °C to yield the desired polyethers consisting of 1, 2, and 4b with a molarratio of 1:1:2 in good yields. This polyether was treated with a cationic catalyst such as BF3OEt2 to givea cross-linked polymer. This polymer synthesis is unusual in that it concurrently constructs both thepolymer backbone and the functional side chains from three starting compounds.
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