377. The preparation of zirconium alkoxides

Triorganyl‐ and Diorganyloxozirconium Hydridoborates – Synthesis and Structures

“…We therefore reacted Zr(OEt) 4 (7) with H 3 B·THF in THF solution (see Table 3). After addition of Zr(OEt) 4 to H 3 B·THF, dissolved in THF, and heating the mixture to 60°C for 7 h, the dominant 11 On further heating, a stronger signal appeared at δ 11 B = 15 ppm in the brown solution.…”

“…The Zr···B distance is 2.371(7) Å, which lies in the range of other zirconium tetrahydridoborates. [3,5,7] The Zr-O bonds are 1.935(3) Å on average, i.e. shorter than in [(tBu 3 CO) 3 Zr(BH 4 )], [8] and the Zr-O-Si bonds angles are quite wide with 170.8°.…”

“…The most stable zirconium hydridoborates contain zirconocene units. [7] They can be obtained from Cp 2 ZrCl 2 and LiBH 4 or LiH 4-n BR n compounds.…”

Synthesis and Spectroscopic Characterization of Two Different Types of Heterobimetallic Glycolate Complexes of Niobium(V)

“…Niobium [15], tantalum [16], titanium [17], zirconium [18], and aluminium [9] isopropoxides were prepared by the methods described in the literature. Nb, Ta, Ti and Zr were determined gravimetrically as oxides [20], whereas Al was estimated as oxinate [20].…”

“…Complexes (12)- (18) were also prepared by the method similar to that described for (11). Preparative and analytical details are summarized in Table 2.…”