Pyrazabole formation by thermolysis of the free acid of the hydrotris(pyrazolyl)borate ion

Borylation directed borylation of N-alkyl anilines using iodine activated pyrazaboles

“…Given the lower yields of 3a using iodine activated pyrazabole Further insight into the structure of 4 came from 19 F NMR spectroscopy, which revealed NTf 2 is not coordinated to boron (d 19F = −78.7, whereas for B-NTf 2 systems d 19F z −69), 21 and DOSY NMR studies (see ESI, Section 5.3 †) which indicated 4 is dimeric. The dimeric structure for 4 presumably is related to the previously reported oxo-bridged dimer D (Scheme 3), 22 with an analogous structure fully consistent with the NMR data for 4 (as a single isomer with a cis arrangement of the aniline-N substituents). Compound 4 converted into the BDB product [2] NTf2 slowly at ambient temperature, but more rapidly and in high conversion on heating.…”

Scorpionates: Coordination Chemistry Comes Home

“…However, no amount of HTp, moderate or excess[5], when reacted with Cp 2 ZrCl 2 , would afford Tp 2 ZrCl 2 . Instead, ill-characterised Zr species, possibly TpZrCl 3 derivatives, were isolated as well as 1,4bispyrazolylpyrazaboles (Figure 5), which are the breakdown products of HTp and whose relative proportions (1,4-cis-or 1,4-trans-) are dictated by the absence or presence of Cp 2 ZrCl 2[6].…”