Phosphino[tris(trimethylsilyl)methyl]Boranes and 2,4-Bis[tris(trimethylsilyl)methyl]-1,3,2,4-diphosphadiboretanes [1]

Autor:	Ralf Jetzfellner, Robert T. Paine, Heinrich Nöth
Rok vydání:	2007
Předmět:	Tris Steric effects Trimethylsilyl chemistry.chemical_element Boranes Medicinal chemistry Inorganic Chemistry chemistry.chemical_compound Monomer chemistry Reagent Organic chemistry Lithium Spectral data
Zdroj:	Zeitschrift für anorganische und allgemeine Chemie. 633:548-556
ISSN:	1521-3749 0044-2313
Popis:	The reaction of tris(trimethylsilyl)methylboron dihalides (Me3Si)3CBX2 (X = Cl, F) with the lithium phosphides LiPHtBu and LiPHmes leads to the phosphinoboranes (Me3Si)3CBX-(PHR), (Me3Si)3CB(PHR)2 or the 1,3,2,4-diphosphadiboretanes [(Me3Si)3CB(PR)]2, depending on the ratio of the reagents, the reaction temperature and concentration. High dilution and low temperatures are required for the synthesis of (Me3Si)3CB(Hal)PHR (1–3) in order to prevent the formation of (Me3Si)3CB(PHR)2 (4 and 5). The latter compounds are best prepared in a two step phosphination from (Me3Si)3CBHal2 and LiPHR. At higher temperatures the four-membered 1,3,2,4-diphosphadiboretanes [(Me3Si)3CB(PR)]26 and 7 are the most stable compounds. On the other hand, compounds of type (Me3Si)3CB(Hal)PR2, 8 and 9, are thermally more stable than the monophosphinoboranes 1–3. Phosphinoboranes of type (Me3Si)3CB(PR2)2 (R = tBu, mes) could not be prepared. NMR and mass spectral data are in accord with the monomeric nature of compounds 1 to 9.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1e4d6c8315f9cce0749b692fe22a4447 https://doi.org/10.1002/zaac.200600335 Zobrazit plný text záznamu Plný text