Process for the preparation of 1-phenylindan photoinitiators

Details Process for the preparation of 1-phenylindan photoinitiators Process for the preparation of 1-phenylindan photoinitiators

2007-12-11

2007-12-11

Witherspoon, Sikarl A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

Reexamination Certificate

active

10553777

ABSTRACT:
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 −20° C. to 20° 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).

REFERENCES:
patent: 4987159 (1991-01-01), Li Bassi et al.
patent: 2004/0116549 (2004-06-01), Visconti et al.
patent: 2005/0004249 (2005-01-01), Fuchs et al.
patent: 02/085832 (2002-10-01), None

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