Hydrotris methimazolyl borate

Submitted by LUIS FERNANDO SOARES and ROSAUCE MENDONCA SILVA Checked by JASON SMEE and MARCETTA DARENSBOURG  

Departamento de Qmmica, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brasil. 

Reglinski et al. reacted methiamazole with NaBH4, following the same procedure that was reported by Trofimenko to prepare the Tp ligand, obtaining the Tm ligand  

The synthesis described below for the Tm ligand is based on Trofimenko s literature reports of trispyrazolyl borate and the trismethimazole borate synthesis of Lobbia et al., with modifications in temperature and solvent washes. Hydrogen evolution is monitored at a lower temperature, starting around 100°C. In this way we obtain very pure Tm in better yields. 

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L6pez-G6mez MJ, Connelly NG, Haddow MF, Hamilton A, Orpen AG. Huxional rhodium scorpionate complexes of the hydrotris(methimazolyl)borate (Tm) ligand and their static boratrane derivatives. Dalton Trans. 2010 39 5221-5230. 

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