5843-32-3Relevant academic research and scientific papers
Tris(borane) adducts of diphosphanylmethanides: The [H3BCH(PPh2BH3)2]- anion and its alkali metal complexes
Langer, Jens,Geitner, Robert,G?rls, Helmar
, p. 5940 - 5947 (2014)
The reactivity of lithium complexes that contain the borane-modified diphoshanylmethanide ligand [CH(PPh2BH3)2]- towards different Lewis base adducts of BH3 was studied to gain further insight into the mechanism of the isomerization of this derivative, which formally proceeds through a shift of one BH3 group from the phosphorus atom to the carbon atom. Whereas the use of BH3·THF in THF only resulted in the thf adduct of the starting material, [Li{CH(PPh2BH3)2}(thf)2] (1), the application of BH3·SMe2 in toluene resulted in the formation of the novel compound [(Li{H3BCH(PPh2BH3)2})∞] (2). The subsequent addition of ethereal ligands led to the isolation of [Li{H3BCH(PPh2BH3)2}(Me4thf)] (3) and [Li{H3BCH(PPh2BH3)2}(thf)3] (4). Treatment of these complexes with stronger Lewis bases such as N,N,N',N'-tetramethylethane-1,2-diamine (tmeda) results in the removal of one phosphorus-bound BH3 molecule and the formation of the [Ph2PCH(BH3)PPh2BH3]- anion. These results indicate that the isomerization of [CH(PPh2BH3)2]- requires an additional BH3 source and a rather strong Lewis base. Complexes 1-4 and the related derivatives [Li{CH(PPh2BH3)2}(Me4THF)] (5) and [K{H3BCH(PPh2BH3)2}(dme)2] (6; dme = 1,2-dimethoxyethane) were characterized by multinuclear NMR spectroscopy and by single-crystal X-ray diffraction analysis.
Contributions to the Chemistry of Boron, 131. A New Ring System of Boron: 1,4-Dimethyl-1,4-dithionia-2,5-diboratacyclohexane
Noeth, Heinrich,Sedlak, Dieter
, p. 1479 - 1486 (2007/10/02)
(CH3)3N*BH2CH2SCH3 (3) was prepared via Li (2).It reacts with CH3I to yield the sulfonium salt I (4) and decomposes on heating to the title compound 8.The latter contains a six-membered ring in chair conformation and the methyl groups in equatorial positions as revealed by X-ray crystallography.
