The title compound, [HB(pz)(3)]VCl2(thf) or [VCl2(C9H10BN6)(C4H8O)] (pz = p
yrazolyl, thf = tetrahydrofuran), is an analogue of the unknown eta(5)-CpVC
l2 (Cp = cyclopentadienyl). The pyrazolyl complex was prepared from VCl3(th
f)(3) and K[HB(pz)(3)]. The molecule adopts a structure comparable to the p
iano-stool arrangement of a half-sandwich complex.