In the presence of silanes bearing Si{H groups, dicobalt octacarbonyl [Co 2 (CO) 8 ] efficiently catalyzes the cationic polymerization of a wide variety of enol ether and other related monomers including vinyl ethers, 1-propenyl ethers, 1-butenyl ethers, 2,3-dihydrofuran, 3,4-dihydro-2H-pyran, keten
Transition metal-catalyzed isomerization and polymerization of allylic and enolic ethers
✍ Scribed by James V. Crivello; Surésh K. Rajaraman
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 194 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
Alkyl allyl ethers undergo facile thermally induced isomerization to alkyl 1-propenyl ethers in the presence of Group VIII transition metal carbonyl compounds as catalysts. The addition of a silane containing a Si-H bond to these systems results in a catalyst system that is capable of not only isomerizing the allyl ether to the 1propenyl ether, but further results in the polymerization of these later compounds. High molecular weight polymers can be obtained directly from the alkyl allyl ether in a single step. The scope and limitations of these polymerizations are described.
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Allyl ethers are readily polymerized using a new polymerization reaction termed: transition metal-catalyzed tandem isomerization and cationic polymerization. Employing dicobalt octacarbonyl in combination with organosilanes, polymerization takes place rapidly and exothermically to give high molecula
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