4-Arylbenzoyl benzoic acid esters, such as the ethylhexyl esters and amyl esters of 4-phenylbenzoyl benzoic acid, are described, which are liquid and show excellent solubility in acrylic or methacrylic monomers. Compounds of Formula 1, wherein R.sup.1, R.sup.2, and A are as defined herein, are disclosed. They are suitable as components for radical photoinitiator systems for UV-curable compositions. ##STR00001##

Process for the production of a diacyl peroxide involving the reaction of an anhydride with a peroxyacid, removal of the formed carboxylic acid, production of an anhydride from said carboxylic acid, and recycling of the anhydride within the process.

Process for the production of a diacyl peroxide involving the reaction of an anhydride with a peroxyacid, removal of the formed carboxylic acid, production of an anhydride from said carboxylic acid, and recycling of the anhydride within the process.

Process for the production of a diacyl peroxide involving the reaction of an anhydride with a peroxyacid, removal of the formed carboxylic acid, production of an anhydride from said carboxylic acid, and recycling of the anhydride within the process.

The invention relates to a continuous method for producing formic acid from CO.sub.2 and extracting the formic acid using compressed CO.sub.2.

The invention relates to a continuous method for producing formic acid from CO.sub.2 and extracting the formic acid using compressed CO.sub.2.

4-Arylbenzoyl benzoic acid esters, such as the ethylhexyl esters and amyl esters of 4-phenylbenzoyl benzoic acid, are described, which are liquid and show excellent solubility in acrylic or methacrylic monomers. Compounds of Formula 1, wherein R.sup.1, R.sup.2, and A are as defined herein, are disclosed. They are suitable as components for radical photoinitiator systems for UV-curable compositions.

##STR00001##

4-Arylbenzoyl benzoic acid esters, such as the ethylhexyl esters and amyl esters of 4-phenylbenzoyl benzoic acid, are described, which are liquid and show excellent solubility in acrylic or methacrylic monomers. Compounds of Formula 1, wherein R.sup.1, R.sup.2, and A are as defined herein, are disclosed. They are suitable as components for radical photoinitiator systems for UV-curable compositions.

##STR00001##

4-Arylbenzoyl benzoic acid esters, such as the ethylhexyl esters and amyl esters of 4-phenylbenzoyl benzoic acid, are described, which are liquid and show excellent solubility in acrylic or methacrylic monomers. Compounds of Formula 1, wherein R.sup.1, R.sup.2, and A are as defined herein, are disclosed. They are suitable as components for radical photoinitiator systems for UV-curable compositions.

##STR00001##

Provided is a method of producing an anhydride of an organic mono-acid comprising contacting an organic mono-acid and a thermally regenerable anhydride to produce the anhydride of the organic mono-acid, and either a diacid of the regenerable anhydride, a partially hydrolyzed regenerable anhydride, or both. In a particular example, acetic acid and glutaric anhydride can be reacted to form acetic anhydride.