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• W2087900204 abstract "In a search for a tripod ligand featuring three ylidic functions based on a phosphineborane skeleton, hydrotris(trimethylphosphonio)borate dibromide [HB{P(CH3)3}3]2+ Br was treated with potassium hydride in tetrahydrofuran to give the corresponding triple-ylide salt potassium hydrotris[methylido(dimethyl)phosphonio]borate, K+[HB{P(CH3)2CH2}3]−. In an attempt to prepare a barium salt of this tripod ligand, the electroneutral doubleylide HB[P(CH3)3][P(CH3)2CH2]2 was isolated from the reaction mixture obtained from equivalent amounts of the potassium salt and barium chloride in tetrahydrofuran with ultrasound activation. Solvent and protic impurities are the probable sources for the protonation. NMR data are presented for the double-ylide and its anionic precursor, and the crystal and molecular structure of the double-ylide has been determined by single-crystal X-ray diffraction. The unit cell of the crystals contains two independent molecules of very similar configuration. Assignments of the P(CH3)3 and P(CH3)2CH2 units are based on bond distance and bond angle criteria.Phosphanboran-Chemie. — Ein anionischer Tripod-Ligand mit drei Ylid-Funktionen und ie Struktur des korrespondierenden elektroneutralen Dopel-YlidsAuf der Suche nach einem Tripod-Liganden mit drei Ylid-Funktionen an einem Phosphanboran-Skelett wurde aus dem Hydro-tris(trimethylphosphonio)borat-dibromid {HB[P(CH3)3]3}2+ Br durch Behandlung mit Kaliumhydrid in Tetrahydrofuran das korrespondierende Tripel-Ylid-Salz Kalium-hydrotris[methylido(dimethyl)phosphonio]borat, K+[HB{P(CH3)2CH2}3]−, hergestellt. Bei Versuchen zur Synthese eines Barium-Salzes dieses Tripod-Liganden wurde aus der Reaktionsmischung aquivalenter Mengen des Kalium-Salzes und Bariumchlorid in Tetrahydrofuran nach Behandlung mit Ultraschall das elektroneutrale Doppel-Ylid HB[P(CH3)3][P(CH3)2CH2]2 erhalten. Das Solvens und protische Verunreinigungen sind die wahrscheinlichen Proton-Quellen bei dieser Umwandlung. Fur das Doppel-Ylid und seine Anion-Vorstufe werden NMR-Daten vorgelegt. Die Kristall- und Molekulstruktur des Doppel-Ylids wurde durch Einkristallrontgenbeugung bestimmt. Die Elementarzelle der Kristalle enthalt zwei unabhangige Molekule sehr ahnlicher Konfiguration. Die Zuordnung der Struktureinheiten zu den Funktionen P(CH3)3 und P(CH3)2CH2 erfolgte nach Abstands- und Winkelkriterien." @default.
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• W2087900204 date "1989-11-01" @default.
• W2087900204 modified "2023-09-22" @default.
• W2087900204 title "Phosphineborane chemistry. — An anionic tripod ligand featuring three ylide functions and the structure of the corresponding electroneutral double-ylide" @default.
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• W2087900204 doi "https://doi.org/10.1002/cber.19891221110" @default.
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