| abstract |
The invention relates to a method for producing triarylorganoborates from organoboronic acid esters in the presence of an n-valent cation 1/n K n+ , comprising the anhydrous treatment of the reaction mixture, and to the use of the obtained triarylorganoborates as coinitiators in photopolymer formulations, holographic media and holograms. The claimed method includes providing an alkyl or cycloalkylboronic acid ester of formula B-R'(OR2)(OR3) in an aprotic solvent in the presence of a metal, adding the aryl halide to produce an organometallic compound in situ, adding a ligand for the ion exchange and separation of the produced metal salts and solids (formula (A)). Triarylalkylborates of formulas (C) and (CC) are also claimed. |