Thiophosgene, a building block for stabilizers bearing different types of protecting fragments

Thiophosgene was used as a reagent for connecting different light and/or UV protecting fragments. Reaction of thiophosgene with stabilizers bearing a hydroxyl group leads to the corresponding chlorothiocarbonates. Their subsequent reactions with other stabilizers bearing a hydroxyl group lead to an unsymmetrical thioester bearing two different protecting fragments. 2,4-Dihydroxybenzophenone and 2,2,6,6-tetramethylpiperidine derivatives were chosen as hydroxyl partners of thiophosgene.