Potassium trispyrazolylborate

Potassium trispyrazolylborate, commonly abbreviated KTp, is the potassium salt with the formula :KHB(C3N2H3)3. This salt is the source of the trispyrazolylborate ligand.

KTp is a white crystalline solid that is soluble in polar solvents, alcohols, and water. The synthesis of KTp involves potassium borohydride and pyrazole without a solvent.
 * KBH4 + 3 C3N2H4 → KHB(C3N2H3)3 + 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] + 3 CO

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