Ciba Specialty Chemicals Corporation

Basf Se Corporation

Thomas Horni

Rinaldo Hüsler

Tunja Jung

Reinhard Sommerlade

André Fuchs

The invention relates to novel photoinitators of formulae (I), (II), (III), (IV), (V) and (VI) wherein Rand Rare each independently of the other C-Calkyl; C-Calkyl substituted by OH, C-Calkoxy, &#x2014;COO(C-Calkyl), (C-Calkyl)-COO&#x2014;, &#x2014;CN, benzyl, phenyl or by &#x2014;N(R)(R); C-Calkerlyl, benzyl, &#x2014;CH&#x2014;CH&#x2014;(C-Calkyl) or phenyl; or Rand Rtogether are unbranched or branched C-Calkylene or C-C-oxa- or -azaalkylene; R, R, Rand Rare each independently of the others hydrogen, C-Calkyl, C-Calkenyl, benzyl, &#x2014;CH&#x2014;CH&#x2014;(C-Calkyl) or phenyl; Rand Rtogether and/or Rand Rtogether are unbranched or branched C-Calkylene; A is CI, Br, &#x2014;O&#x2014;R, &#x2014;N(R)(R) or &#x2014;S&#x2014;R, A' is &#x2014;O&#x2014;, &#x2014;NH&#x2014; or &#x2014;NR&#x2014;; A&#x2033; is CI, Br, &#x2014;O&#x2014;R, &#x2014;N(R)(R) or &#x2014;S&#x2014;Ror hydrogen, X is &#x2014;O&#x2014;Ror &#x2014;N(R)(R), n is an integer from 1 to 10, preferably an integer from 1 to 4, especially 1, 2 or 3; Ris a linker; Ris a bivalent C-Calkylele radical. 

Photoinitiators

The invention relates to a process for the preparation of a crystalline isomeric mixture of compounds of formulae (I) and (II) which process comprises the following steps: a) the slow addition of aluminium chloride, in portions, to a solution comprising 1,1,3-trimethyl-3-phenylindan and isobutyric acid halide in a suitable solvent at a reaction temperature of from &#x2212;20&#xb0; C. to 20&#xb0; C., an isomeric mixture consisting of compounds of formulae (Ia) and (IIa) being obtained; b) enol chlorination of compounds (Ia) and (IIa), an isomeric mixture consisting of compounds of formulae (Ib) and (IIb) being obtained; c) hydrolysis of the chlorinated isomeric mixture from step b). The invention relates also to the preparation of the individual compounds (I) and (II). 

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Bärschwil, Switzerland

Thomas Horni