Počet záznamů: 1
Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry
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SYSNO ASEP 0343150 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Structural Defects in Polyallylcarbosilane Dendrimers and Their PolyolDerivatives Characterized by NMR and MALDI-TOF Mass Spectrometry Tvůrce(i) Krupková, Alena (UCHP-M) RID, ORCID, SAI
Čermák, Jan (UCHP-M) RID, ORCID, SAI
Walterová, Zuzana (UMCH-V)
Horský, Jiří (UMCH-V) RID, ORCIDZdroj.dok. Macromolecules. - : American Chemical Society - ISSN 0024-9297
Roč. 43, č. 10 (2010), s. 4511-4519Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova carbosilane dendrimers ; maldi-tof ms ; structural defects Vědní obor RIV CC - Organická chemie CEP LC06070 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy CEZ AV0Z40720504 - UCHP-M (2005-2011) AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000277649500014 DOI 10.1021/ma100315w Anotace 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. Pracoviště Ústav chemických procesů Kontakt Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Rok sběru 2011
Počet záznamů: 1