About: Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry

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About: Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	A series of polyallylcarbosilane dendrimers and carbosilane-based dendritic polyols up to third generation was analyzed by means of MALDI-TOF MS and multinuclear NMR to determine the character, origin, and number of structural defects. Several side reactions accompanying hydrosilylation, from which isomerization of terminal double bonds was the most abundant, were detected during the synthesis of carbosilane skeleton. Despite increased steric hindrance, internal double bonds react in subsequent addition reactions. Depending on the synthetic sequence applied, the retained reactivity of the internal double bonds can lead either to suppression of the defect in the next generation or to creation of more significant defects such as dendrimer dimers. Hydroboration of allyl groups using dicyclohexylborane proceeded with near quantitative conversion; a small amount of hydrolysis accompanying the following oxidation step producing nonreactive alkyl groups at the periphery was detected. A series of polyallylcarbosilane dendrimers and carbosilane-based dendritic polyols up to third generation was analyzed by means of MALDI-TOF MS and multinuclear NMR to determine the character, origin, and number of structural defects. Several side reactions accompanying hydrosilylation, from which isomerization of terminal double bonds was the most abundant, were detected during the synthesis of carbosilane skeleton. Despite increased steric hindrance, internal double bonds react in subsequent addition reactions. Depending on the synthetic sequence applied, the retained reactivity of the internal double bonds can lead either to suppression of the defect in the next generation or to creation of more significant defects such as dendrimer dimers. Hydroboration of allyl groups using dicyclohexylborane proceeded with near quantitative conversion; a small amount of hydrolysis accompanying the following oxidation step producing nonreactive alkyl groups at the periphery was detected. (en)
Title	Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry (en)
skos:prefLabel	Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry (en)
skos:notation	RIV/67985858:_____/10:00343150!RIV11-MSM-67985858
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(LC06070), Z(AV0Z40500505), Z(AV0Z40720504)
http://linked.open...iv/cisloPeriodika	10
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Čermák, Jan Krupková, Alena
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav chemických procesů AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	290432
http://linked.open...ai/riv/idVysledku	RIV/67985858:_____/10:00343150
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	carbosilane dendrimers; maldi-tof ms; structural defects (en)
http://linked.open.../riv/klicoveSlovo	carbosilane dendrimers structural defects maldi-tof ms
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[819FA4179C9C]
http://linked.open...i/riv/nazevZdroje	Macromolecules
http://linked.open...in/vavai/riv/obor	CC
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	The structure and synthetic applications of transition metal complexes
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	43
http://linked.open...iv/tvurceVysledku	Horský, Jiří Krupková, Alena Čermák, Jan Walterová, Zuzana
http://linked.open...ain/vavai/riv/wos	000277649500014
http://linked.open...n/vavai/riv/zamer	Progresivní makromolekulární materiály a supramolekulární systémy: syntéza a studium vlastností, jevů a možností využití pro speciální aplikace a moderní technologie Investigation of multiphase reacting systems for the design of processes important in synthesis and preparation of novel materials, in energy production and in environmental protection
issn	0024-9297
number of pages	9 (xsd:int)

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