81116-58-7

Upstream product

• 52806-20-9 3,5-Dinitrophthalic anhydride 
• 108-98-5 thiophenol 
• 4277-02-5 3,5-dinitrophthalic acid 
• 81116-57-6 5-nitro-3-(phenylthio)phthalic acid 

Downstream Products

• 81116-48-5 ethyl 3-phenylsulfonyl-9-oxo-9H-thioxanthene-1-carboxylate 

Relevant academic research and scientific papers

92. Aromatic Nucleophilic Substitution. Part 1. Regiospecific Substitution of the Nitro Groups in 3,5-Dinitrophthalic-Acid Derivatives

The regioselectivity of nucleophilic substitution of the nitro groups in 3,5-dinitrophthalic anhydrides and 3,5-dinitrophthalimides (Scheme) with a variety of nucleophiles (Nu(1-)) was studied.In all case, the 3-nitro group was selectively substituted.With excess of the same nucleophilic reagent or with other nucleophiles, the 5-nitro group could subsequently be replaced.

Thioxanthonecarboxylic acids and thioxanthonecarboxylic acid derivatives

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.