Matches in SemOpenAlex for { <https://semopenalex.org/work/W4244149574> ?p ?o ?g. }
Showing items 1 to 62 of
62
with 100 items per page.
- W4244149574 endingPage "473" @default.
- W4244149574 startingPage "467" @default.
- W4244149574 abstract "Tris(trimethylsilyl)silyllithium (3) reacted with aldehydes and ketones (molar ratio 2 : 1) according to a modified Peterson mechanism under formation of transient silenes, which were immediately trapped by excess 3 to give the organolithium derivatives (Me3Si)3SiSi(SiMe3)2C(Li)R1R2 (7). Hydrolysis of 7 afforded the alkylpolysilanes (Me3Si)3SiSi(SiMe3)2CHR1R2 (8). Depending on the substituents R1 and R2, 7 proved to be rather unstable in THF solution and underwent a rapid rearrangement, involving a 1,3-Si,C-trimethylsilyl migration, resulting in the formation of the lithium silanides (Me3Si)2Si(Li)Si(SiMe3)2C(SiMe3)R1R2 (9), which were hydrolized during the aqueous workup to give the H-silanes (Me3Si)2Si(H)Si(SiMe3)2C(SiMe3)R1R2 (10). Reaction of 9 with chlorotrimethylsilane produced the 1-trimethylsilylalkylpolysilanes (Me3Si)3SiSi(SiMe3)2C(SiMe3)R1R2 (11). The structures of the products described were elucidated by comprehensive spectral analyses. The results of X-ray crystal structure analyses, performed for 8 l (R1 = H, R2 = 2,4,6-(MeO)3C6H2), 10 d (R1 = H, R2 = Mes) and 11 d (R1 = H, R2 = Mes) are discussed and confirm the expected extreme sterical congestion of the molecules. Die Reaktion transienter 1,1-Bis(trimethylsilyl)silene mit Tris(trimethylsilyl)silyllithium – Synthese und Struktur sterisch überladener 1-Trimethylsilylalkylpolysilane Tris(trimethylsilyl)silyllithium (3) reagierte mit Aldehyden und Ketonen (Molverhältnis 2 : 1) nach einem modifizierten Peterson-Mechanismus unter Bildung transienter Silene, die sofort durch überschüssiges 3 abgefangen wurden und die Organolithium-Derivative (Me3Si)3SiSi(SiMe3)2C(Li)R1R2 (7) lieferten. Durch Hydrolyse von 7 wurden die Alkylpolysilane (Me3Si)3SiSi(SiMe3)2CHR1R2 (8) erhalten. Abhängig von den Substituenten R1 und R2, erwiesen sich die Verbindungen 7 als in THF instabil und unterlagen rascher Umlagerung, einer 1,3-Si,C-Trimethylsilylwanderung, wobei die Lithiumsilanide (Me3Si)2Si(Li)Si(SiMe3)2C(SiMe3)R1R2 (9) resultierten, die durch die hydrolytische Aufarbeitung in die H-Silane (Me3Si)2Si(H)Si(SiMe3)2C(SiMe3)R1R2 (10) übergeführt wurden. Die Reaktion von 9 mit Chlortrimethylsilan lieferte die 1-Trimethylsilylalkylpolysilane (Me3Si)3SiSi(SiMe3)2C(SiMe3)R1R2 (11). Die Strukturen der erhaltenen Produkte wurden durch umfassende spektroskopische Charakterisierung gesichert. Die Ergebnisse der für 8 l (R1 = H, R2 = 2,4,6-(MeO)3C6H2), 10 d (R1 = H, R2 = Mes) und 11 d (R1 = H, R2 = Mes) durchgeführten Röntgenstrukturanalysen bestätigten die erwartete sterische Belastung der Moleküle." @default.
- W4244149574 created "2022-05-12" @default.
- W4244149574 creator A5040436484 @default.
- W4244149574 creator A5067360501 @default.
- W4244149574 creator A5084405591 @default.
- W4244149574 date "1999-03-01" @default.
- W4244149574 modified "2023-10-14" @default.
- W4244149574 doi "https://doi.org/10.1002/(sici)1521-3749(199903)625:3<467::aid-zaac467>3.3.co;2-c" @default.
- W4244149574 hasPublicationYear "1999" @default.
- W4244149574 type Work @default.
- W4244149574 citedByCount "1" @default.
- W4244149574 countsByYear W42441495742015 @default.
- W4244149574 crossrefType "journal-article" @default.
- W4244149574 hasAuthorship W4244149574A5040436484 @default.
- W4244149574 hasAuthorship W4244149574A5067360501 @default.
- W4244149574 hasAuthorship W4244149574A5084405591 @default.
- W4244149574 hasConcept C134018914 @default.
- W4244149574 hasConcept C155647269 @default.
- W4244149574 hasConcept C178790620 @default.
- W4244149574 hasConcept C185592680 @default.
- W4244149574 hasConcept C2777000832 @default.
- W4244149574 hasConcept C2778024649 @default.
- W4244149574 hasConcept C2778183973 @default.
- W4244149574 hasConcept C2778541603 @default.
- W4244149574 hasConcept C2781014771 @default.
- W4244149574 hasConcept C55493867 @default.
- W4244149574 hasConcept C71240020 @default.
- W4244149574 hasConcept C71924100 @default.
- W4244149574 hasConcept C94412978 @default.
- W4244149574 hasConceptScore W4244149574C134018914 @default.
- W4244149574 hasConceptScore W4244149574C155647269 @default.
- W4244149574 hasConceptScore W4244149574C178790620 @default.
- W4244149574 hasConceptScore W4244149574C185592680 @default.
- W4244149574 hasConceptScore W4244149574C2777000832 @default.
- W4244149574 hasConceptScore W4244149574C2778024649 @default.
- W4244149574 hasConceptScore W4244149574C2778183973 @default.
- W4244149574 hasConceptScore W4244149574C2778541603 @default.
- W4244149574 hasConceptScore W4244149574C2781014771 @default.
- W4244149574 hasConceptScore W4244149574C55493867 @default.
- W4244149574 hasConceptScore W4244149574C71240020 @default.
- W4244149574 hasConceptScore W4244149574C71924100 @default.
- W4244149574 hasConceptScore W4244149574C94412978 @default.
- W4244149574 hasIssue "3" @default.
- W4244149574 hasLocation W42441495741 @default.
- W4244149574 hasOpenAccess W4244149574 @default.
- W4244149574 hasPrimaryLocation W42441495741 @default.
- W4244149574 hasRelatedWork W1555385797 @default.
- W4244149574 hasRelatedWork W1971434477 @default.
- W4244149574 hasRelatedWork W1972750290 @default.
- W4244149574 hasRelatedWork W1976009413 @default.
- W4244149574 hasRelatedWork W2070880805 @default.
- W4244149574 hasRelatedWork W2395087774 @default.
- W4244149574 hasRelatedWork W2396027010 @default.
- W4244149574 hasRelatedWork W2401664968 @default.
- W4244149574 hasRelatedWork W3137909308 @default.
- W4244149574 hasRelatedWork W2953133943 @default.
- W4244149574 hasVolume "625" @default.
- W4244149574 isParatext "false" @default.
- W4244149574 isRetracted "false" @default.
- W4244149574 workType "article" @default.