81116-48-5Relevant articles and documents
93. Aromatic Nucleophilic Substitution. Part 2. Preparation of Novel 3-Substituted Xanthone and Thioxanthone Derivatives
Fischer, Walter,Kvita, Vratislav
, p. 854 - 859 (1985)
The novel 3-nitro-9-oxo-9H-xanthene- and 3-nitro-9-oxo-9H-thioxanthene-1-carboxylic acids 2a-d were prepared by intramolecular acylation of 3-aryloxy- and 3-arylthio-5-nitrophthalic anhydrides 1 (Scheme).The 3-nitro group was readily substituted by O- and
Thioxanthonecarboxylic acids and thioxanthonecarboxylic acid derivatives
-
, (2008/06/13)
Novel thioxanthonecarboxylic acids and thioxanthonecarboxylic acid derivatives of the formula I STR1 in which Y is --COOH, --CO-halogen, --CN or a carboxylic acid ester, thioester or amide group and X, Z and W are as defined in the patent claim, are described. The compounds of the formula I in which Y is other than --CO--halogen are suitable as sensitizers for photo-crosslinkable polymers or as initiators for photo-polymerization of ethylenically unsaturated compounds or for photo-chemical crosslinking of polyolefins. The acid halides of the formula I are starting materials for the preparation of the corresponding nitriles and carboxylic acid esters, thioesters and amides.