✍ Scribed by Takahide Mizawa; Katsuhiko Takenaka; Tomoo Shiomi
No coin nor oath required. For personal study only.
The synthesis of heterotelechelic poly(methyl methacrylate) (PMMA) containing ␣-maleimide--dienyl end-groups and its subsequent intramolecular cyclization are described. The anionic polymerization of methyl methacrylate was carried out with 3-tert-butyldimethylsilyloxypropyl-1-lithium and 5-bromo-1,3-pentadiene as the initiator and terminator, respectively, to synthesize ␣-hydroxy--dienyl-PMMA. The introduction of the maleimide group to the ␣ chain end by the reaction of the sodium salt of the polymer with N-(3-chloromethylphenyl)-maleimide or N-(3-bromomethylphenyl)maleimide was not successful because of the nucleophilic addition of alkoxide to the carbonOcarbon double bond of the maleimide group. When 4,4Ј-bismaleimidediphenylether was allowed to react with the alkoxide, the aimed ␣-maleimide--dienyl-PMMA was obtained in a good yield. Ring closure by the intramolecular Diels-Alder reaction was carried out by the heating of the dilute polymer solution in tetrahydrofuran.
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