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Ring-opening of 1,2,3,4-tetramethyl-1,2,3,4-tetraphenylcyclotetrasilane in the presence of transition metal catalysts

✍ Scribed by Jerzy Chrusciel; Krzysztof Matyjaszewski

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 671 KB
Volume: 34
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(199608)34:11<2243::aid-pola19>3.0.co;2-f

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✦ Synopsis

Ring opening of 1,2,3,4-tetramethyl-1,2,3,4-tetraphenylcyclotetrasilane in the presence of various transition metal catalysts has been studied. Pd and Pt compounds are most active. Compounds with bulky ligands [e.g., Pd(PPh,),] lead to the formation of "dimeric" cyclooctasilanes. Compounds with less bulky groups convert monomer to dimers and mixture of oligomers and polymers. Reactions with the all-trans monomer, tttt-(MePhSi),, result in the formation of stereoregular dimer, presumably all-trans, tttttttt-(MePhSi),, in high yields. Reactions in the presence of oxygen lead to the formation of polymers with inserted oxygen atoms in the main chain.

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