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Abstract

The invention relates to a process for preparing metal difluorochelatoborates, in which a metal bis(chelato)borate of the formula M[BL₂] is reacted with boron trifluoride and a metal fluoride (MF) and/or a metal salt of the chelating ligand (M₂L) where M+ is a monovalent cation selected from the group consisting of lithium, sodium, potassium and ammonium NR₄⁺, where R═H, alkyl (C1 to C8) and L is a chelating agent having two terminal oxygen atoms and having the general formula (II), where: when m=1 and Y¹ and Y² together with C¹ form a carbonyl group, n=0 or 1 and o=0 or 1 and R¹ and R² are each, independently of one another, H or alkyl having from one to eight carbon atoms (C1-C8) and Y³, Y⁴ are each, independently of one another, OR³ (R³═C1-C8-alkyl), then n or o≠1: p=0 or 1 and when n and o=0, p=1; or Y¹, Y², Y³, Y⁴ are each, independently of one another, OR³ (R³═C1-C8-alkyl), m=1, n=0 or 1, o=1 and p=0; or C² and C³ are members of a 5- or 6-membered aromatic or heteroaromatic ring (with N, O or S as heteroelement) which can optionally be substituted by alkyl, alkoxy, carboxy or nitrile, where R¹, R², Y³ and Y⁴ are absent, m=0 or in the case of 1, Y¹ and Y² together with C¹ form a carbonyl group and p is 0 or 1, in an organic, aprotic solvent.

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First Claim