ZfN: Search Results

1	Author	W. Uhlig	Requires cookie*
	Title	Benzyliden-und Methylen-bis-silyltriflate als neue Synthesebausteine für Organosiliciumpolymere Benzylidene-and Methylene-bis-silyltriflates as New Synthetic Materials for Organosilicon Polymers
	Abstract	The title compounds have been prepared by reaction of phenyl-, allyl-or amino-substituted disilylmethanes and disilylphenylmethanes with trifluoromethanesulfonic acid. New organo silicon oligomers and polymers are obtained in good yields and high purities from these silyltriflates and lithium acetylides, triphenylgermyllithium or diphenylsilanediol/triethyl-amine. In these compounds the carbosilane units are connected by alkyne or siloxane bridges. The structures have been confirmed by NMR spectroscopy (29Si, 13C, 'H) and elemental analysis.
	Reference	Z. Naturforsch. 49b, 609—614 (1994); eingegangen am 17. Januar 1994
	Published	1994
	Keywords	Silyltriflates, Polycarbosilanes, Protodesilylation, Disilylmethanes
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	TEI-XML for	default:Reihe_B/49/ZNB-1994-49b-0609.pdf
	Identifier	ZNB-1994-49b-0609
	Volume	49

2	Author	Wolfram Uhlig	Requires cookie*
	Title	Kaliumgraphit -ein effizientes Reduktionsmittel zur Darstellung von Polysilinen Potassium-Graphite -an Efficient Reducing Agent for the Formation of Polysilynes
	Abstract	Potassium-graphite (C8K) reduces phenyltrichlorosilane to give polyphenylsilynes in high yields. Branched copolysilanes have been prepared via reductive coupling of phenyltrichlorosi lane and diorganodichlorosilanes with C8K. Polymers of this type are also obtained by reductive coupling of triflate substituted polysilanes with C8K. The soluble polymers and copolymers with molecular weights in the range « 4000 to 10000 have been characterized by 29Si-NMR spectroscopy.
	Reference	Z. Naturforsch. 50b, 1674—1678 (1995); eingegangen am 18. April 1995
	Published	1995
	Keywords	Polysilynes, Polysilanes, Potassium-Graphite, Silyltriflates
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-1674.pdf
	Identifier	ZNB-1995-50b-1674
	Volume	50

3	Author	Wolfram Uhlig, Herrn	Requires cookie*
	Title	Zur Darstellung neuer Polysiline und vernetzter Polysilane Synthesis of Novel Polysilynes and Branched Polysilanes
	Abstract	The reductive coupling of halogenated oligosilanes with potassium-graphite leads to novel polysilynes and branched polysilanes. The ratio of quarternary silicon atoms, monoorganosilyl-and diorganosilylgroups in the polymers can be modified by variation in the structure of the starting materials. In this way the properties of the preceramic polymers (molecular weights, solubility, content of carbon, degree of cross-linking) are influenced. The compounds are characterized by 29Si NMR spectroscopy.
	Reference	Z. Naturforsch. 51b, 703—710 (1996); eingegangen am 18. Dezember 1995
	Published	1996
	Keywords	Polysilanes, Polysilynes, Silyltriflates, Potassium-graphite
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	TEI-XML for	default:Reihe_B/51/ZNB-1996-51b-0703.pdf
	Identifier	ZNB-1996-51b-0703
	Volume	51

4	Author	Wolfram Uhlig, Herrn	Requires cookie*
	Title	Funktionalisierung und Vernetzung von Poly(silylenmethylenen) Functionalization and Cross-Linking of Poly(silylenemethylenes)
	Abstract	Functionalized 1,3-disilacyclobutanes (RSiX-CH2)2 have been prepared by protodesilylation of aminosubstituted 1,3-disilacyclobutanes with triflic acid and by conversions with nucleo philes. The ring-opening polymerisations of these compounds lead to novel high molecular weight poly(silylenemethylenes), which are characterized by a linear structure and alternating silicon and carbon atoms in the main chain. The hydrosilylation reaction between the po-ly(silylenemethylenes) (RSiH-CH2)n and (RSiVi-CH2)n results in a polymer network which may serve as an interesting preceramic material. The structures of the polymers were proven by NMR spectroscopy (29Si, 13C, 'H).
	Reference	Z. Naturforsch. 52b, 577—586 (1997); eingegangen am 5. Februar 1997
	Published	1997
	Keywords	Poly(silylenemethylenes), Silyltriflates, Disilacyclobutanes, Ring-opening Polymerization
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	TEI-XML for	default:Reihe_B/52/ZNB-1997-52b-0577.pdf
	Identifier	ZNB-1997-52b-0577
	Volume	52