Palladium-catalyzed formation and reactions of iodo- and bromosiloxane intermediates
Journal of Organometallic Chemistry 697 巻 1 号
51-56 頁
2012 発行
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種類 :
全文
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タイトル ( eng ) |
Palladium-catalyzed formation and reactions of iodo- and bromosiloxane intermediates
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作成者 |
Lu Zhou
Mizumo Tomonobu
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収録物名 |
Journal of Organometallic Chemistry
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巻 | 697 |
号 | 1 |
開始ページ | 51 |
終了ページ | 56 |
抄録 |
Polysiloxanes are useful materials because of their functionality, such as high thermal stability, electrical resistance, and hydrophobicity. In this regard, we studied palladium-catalyzed formation of iodo-and bromopolysiloxanes from two types of hydrosiloxanes, alpha,omega-dihydropoly(dimethylsiloxane) (1) and cyclotetra(hydromethylsiloxane) (2), and their reactions. Treatment of 1 with mixtures of cyclic ethers or lactones and MeI or allylBr in the presence of a catalytic amount of PdCl2 gave the corresponding alpha,omega-bis(haloalkoxy and haloalkanoyloxy) poly(dimethylsiloxane)s in good yields, via iodo-and bromopoly(dimethylsiloxane) intermediates. Transformation of the iodobutoxy-terminal units in the resulting poly(dimethylsiloxane) into aminoalkoxy groups was examined. The formation of alpha,omega-diiodo- and dibromopoly(dimethylsiloxane)s from 1 was confirmed by spectrometric analysis as well as by quenching experiments with ethanol. A reaction of alpha,omega-dibromopoly(dimethylsiloxane) with 2,5-dilithiothiophene gave a polydimethylsiloxane-thiophene alternating polymer. Similar palladiumcatalyzed reactions of 2 with THF/MeI, THF/allylBr, and delta-valerolactone/allylBr afforded cyclo(halobutoxy- and bromobutanoyloxymethylsiloxane) s in moderate yields. This would provide a new strategy for the introduction of various substituents to the terminal positions of linear polysiloxane and to the cyclosiloxane core.
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著者キーワード |
Polysiloxane
Boromosilane
Iodosilane
Palladium catalyst
Cyclic ether
Lactone
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NDC分類 |
化学 [ 430 ]
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言語 |
英語
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資源タイプ | 学術雑誌論文 |
出版者 |
Elsevier Science SA
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発行日 | 2012 |
権利情報 |
(c) 2012 Elsevier B.V. All rights reserved.
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出版タイプ | Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版) |
アクセス権 | オープンアクセス |
収録物識別子 |
[ISSN] 0022-328X
[DOI] 10.1016/j.jorganchem.2011.10.012
[NCID] AA00704122
[DOI] http://dx.doi.org/10.1016/j.jorganchem.2011.10.012
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