| abstract |
Compounds of formula I. in which n and o are a number from 0 to 50, m is a number from 1-50, u and v are 0 or 1, at least one of the indices u or v being 1, R 1 , R 2 , R 2a , R 3 and R 4 are, for example, independently of one another aromatic hydrocarbons, R 5 if n and o are the number 0, for example C 1 -C 12 -alkyl and if n and / or o are greater than 0 or if n and o are the number 0 and at the same time only means an index u or v 1, R 5 can additionally represent, for example, an aromatic hydrocarbon, at least one of the radicals R 1 , R 2 , R 2a , R 3 , R 4 or R 5 one in represents ortho position to the boron atom sterically hindered aromatic hydrocarbon radical, X is for example C 1 -C 20 alkylene, phenylene, biphenylene etc. and Z represents a radical which can form positive ions are suitable as photoinitiators, both the compounds as such, as well as their combination with dyes or other electron acceptors. In addition, the polyborane precursors of these borates together with borate salts have photoinitiating properties. |