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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F10%3A00343150" target="_blank" >RIV/61389013:_____/10:00343150 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/10:00343150

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 additionreactions. 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 additionreactions. 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CC - Organická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/LC06070" target="_blank" >LC06070: Struktura a syntetické aplikace komplexů přechodných kovů</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Macromolecules

ISSN

0024-9297

e-ISSN

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Svazek periodika

43

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

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Kód UT WoS článku

000277649500014

EID výsledku v databázi Scopus

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