Potassium trispyrazolylborate

Potassium trispyrazolylborate, commonly abbreviated KTp, is the potassium salt of the trispyrazolylborate ligand.

KTp is a white crystalline solid which is soluble in polar solvents, alcohols, and water. The synthesis of KTp involves potassium borohydride and pyrazole without a solvent.

KBH₄ + 3 pzH → KTp + 3 H₂

The tris(pyrazolyl)borate forms octahedral coordination compounds with the formula M[Tp]₂ with first row transition metals. KTp also forms 1:1 complexes, for example it can be converted to K[TpMo(CO)₃];

KTp+Mo(CO)₆→K[TpMo(CO)₃ ]+ 3CO

When K[TpMo(CO)₃] is treated with butyl nitrite it yields the neutral orange complex TpMo(CO)₂NO.

K[TpMo(CO)₃]+ BuONO→TpMo(CO)₂NO+CO+KOBu