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• W2110368821 endingPage "57" @default.
• W2110368821 startingPage "45" @default.
• W2110368821 abstract "New macrocyclic carbodiazasilane molecules functionalized with the monoanionic [2,6-(CH2NMe2)2C6H3]− ≡ N,C,N pincer ligand have been prepared and tested as active Lewis acid catalysts for the aldol condensation reaction. The tripalladated dendritic compound (see figure) showed higher reaction rates for the dendritic structure than the corresponding mononuclear system. The preparation of a series of new macrocyclic carbodiazasilane molecules functionalized with the monoanionic [2,6-(CH2NMe2)2C6H3]− ≡ N,C,N-pincer ligand has been accomplished. Palladation of these systems was possible through oxidative addition with [Pd(dba)2] affording exclusive formation of the meso diastereoisomer. The X-ray crystal structures of these novel ligands and of the palladium(II) complex 10 were determined and confirmed the stereochemistry of the organopalladium cage. Attachment of the para-OH functionalized carbodiazasilane macrocycle 16 to a central core led to the formation of the dendritic structure 18 which was palladated to afford the novel multimetallic dendritic system with encapsulated catalytic sites 1. This cyclopalladated carbosilane dendrimer (1) as well as the mononuclear organopalladium cage 10 can be conveniently converted into active Lewis acid catalysts for the aldol condensation reaction. The catalytic data showed higher reaction rates for the dendritic structure than for the corresponding mononuclear systems. Dit onderzoek beschrijft de synthese van een reeks nieuwe, macrocyclische carbodiazasilaan moleculen, die het monoanionisch drievoudig-gecoördineerde tangligand [2,6-(CH2NMe2)2C6H3]− ≡ N,C,N bevatten. Deze systemen kunnen door oxidatieve additie met [Pd(dba)2] gepalladeerd worden, waarbij selectief de meso-diastereoisomeren gevormd worden. De structuren van de nieuwe liganden en van het palladium(II)complex 10 zijn kristallografisch onderzocht. Deze kristalstructuuranalyse bevestigt de meso-stereochemie van complex 10. Het gebruik van de para-OH gefunctionaliseerd macrocyclische carbodiazasilaan verbinding 16 in een convergente synthese-route leidde tot de vorming van de dendritische structuur 18. Het multi-metallo-dendritische systeem 1 met ingekapselde katalytische centra werd gesynthetiseerd door palladering van verbinding 18. Het cyclopalladeerde carbosilanedendrimeer 1 en de mononucleaire organopalladium-kooi 10 kunnen eenvoudig omgezet worden in kationische (Lewis zure) centra en zijn getest als katalysatoren in de aldol-condensatiereactie. De katalytische activiteit van de dendritische structuur blijk hoger te zijn dan die van de mononucleaire systemen." @default.
• W2110368821 created "2016-06-24" @default.
• W2110368821 creator A5035216935 @default.
• W2110368821 creator A5037093217 @default.
• W2110368821 creator A5070010505 @default.
• W2110368821 creator A5089521767 @default.
• W2110368821 date "2002-01-04" @default.
• W2110368821 modified "2023-10-16" @default.
• W2110368821 title "New Mono- and Tricyclopalladated Dendritic Systems with Encapsulated Catalytic Sites" @default.
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• W2110368821 doi "https://doi.org/10.1002/1521-3765(20020104)8:1<45::aid-chem45>3.0.co;2-p" @default.
• W2110368821 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11822464" @default.
• W2110368821 hasPublicationYear "2002" @default.
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