Patent ID: 6441216
Filing Date: 2002-08-27
Classification: C07F,H01M,Y02E

Abstract:
A method of preparing a lithium complex salt of the formula (I) whereR1 and R2 are optionally directly linked to one another via a single or double bond, and each, independently is phenyl, naphthyl, anthracenyl or phenanthrenyl, optionally mono- to hexasubstituted by C1-C6 alkyl, C1-C6-alkoxy or halogen; or each independently is pyridyl, pyrazyl or pyrimidyl, each optionally mono- to tetrasubstituted by C1-C6-alkyl, C1-C6-alkoxy or halogen; or each independently is hydroxybenzenecarboxyl, hydroxynaphthalenecarboxyl, hydroxy-benzenesulfonyl or hydroxynaphthalenesulfonyl, each optionally mono- to tetrasubstituted by C1-C6 alkyl, C1-C6-alkoxy groups or halogen; ring substituents R3-R6 are optionally directly linked to an adjacent ring substituent via a single or double bond and are C1-C6-alkyl, C1-C6-alkoxy or halogen, phenyl, naphthyl, anthracenyl or phenanthrenyl, each optionally mono- to hexasubstituted by C1-C6-alkyl, C1-C6-alkoxy or halogen; pyridyl, pyrazyl or pyrimidyl, each optionally mono- to tetrasubstituted by C1-C6-alkyl, C1-C6-alkoxy or halogen; said method comprising: a) admixing a 3-, 4-, 5-, 6-substituted phenol in a suitable solvent with chlorosulfonic acid to form a first intermediate; b) reacting the first intermediate from a) with chlorotrimethylsilane to form a second intermediate; and c) reacting the second intermediate from b) with lithium tetramethanolate borate (1âˆ’) in a suitable solvent to produce an end product of formula (I) therefrom.