| 摘要 |
Titanocenes containing two 5-membered cyclodienyl groups, for example cyclopentadienyl, and one or two 6-membered carbocyclic or 5- or 6-membered heterocyclic aromatic rings which are substituted by a fluorine atom in at least one of the two ortho-positions to the titanium-carbon bond and contain, as a further substituent, unsubstituted or substituted 1-pyrryl, are suitable as photoinitiators for radiation-induced polymerization of ethylenically unsaturated compounds. The titanocenes have the formula I (I) in which both R1 radicals, independently of each other, are, for example, cyclopentadienyl?, idenyl? or 4,5,6,7-tetrahydroidenyl? each of which may be substituted by a substituent like C1-C18-alkyl or both R1 groups taken together may , for example, be a radical of the formula II (II) in which X represents (CH2)n wherein n = 1, 2 or 3, R2 may be, for example, a 6-membered carbocyclic or 5- or 6membered heterocyclic aromatic ring substituted by fluorine in at least one of the two ortho positions to the titanium-carbon bonds and R3 may be as defined for R3 or R2 and R3 together may be -Q-Y-Q-wherein Q is a carbocyclic aromatic ring where the two bonds are in the ortho position with respect to the Y and the titaniumcarbon bond and Y is a group such as -CH2-.
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