Abstract
As a result of our study on the interaction between the octahydrotriborate anion with nucleophiles (Nu = THF, Ph3P, Ph2P-(CH2)2-PPh2 (dppe), Ph3As, Et3N, PhNH2, C5H5N, CH3CN, Ph2CHCN)) in the presence of a wide range of Lewis acids (Ti(IV), Hf(IV), Zr(IV), Al, Cu(I), Zn, Mn(II), Co(II) halides and iodine), a number of substituted derivatives of the octahydrotriborate anion [B3H7Nu] are obtained. It is found that the use of TiCl4, AlCl3, ZrCl4, HfCl4, CuCl and iodine leads to the highest product yields. In this case, it is most likely that the reaction proceeds through the formation of an intermediate [B3H7-HMXnx], which was detected by NMR spectroscopy. The structures of [Ph3P·B3H7] and [PhNH2·B3H7] were determined by X-ray diffraction.
Highlights
The interaction of the [B3 H8 ]− anion with nucleophiles in the presence of Lewis acids is a modern method for the preparation of its substituted derivatives [B3 H7 Nu] [1,2,3,4]
Substituted derivatives of the octahydrotriborate anion can act as ligands in complexes of transition metals [14,15,16], which does not exclude their use in the preparation of boride coatings [17,18], as was previously shown for some complexes of the octahydrotriborate anion [19,20]
The molar molarratio ratioofofthe the initial amounts of tetrabutylammonium octahydrotriborate electrophile in this work waswas
Summary
The interaction of the [B3 H8 ]− anion with nucleophiles in the presence of Lewis acids is a modern method for the preparation of its substituted derivatives [B3 H7 Nu] [1,2,3,4]. Special attention should be paid to the effect of Lewis acids on the reaction course. Substituted derivatives of the octahydrotriborate anion [B3 H7 Nu]. Substituted derivatives of the octahydrotriborate anion can act as ligands in complexes of transition metals [14,15,16], which does not exclude their use in the preparation of boride coatings [17,18], as was previously shown for some complexes of the octahydrotriborate anion [19,20]. Substituted [B3 H8 ]− derivatives can be considered as precursors to substituted higher boron clusters (e.g., B5 H9 , B4 H10 )
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