Sumitomo Seika Chemicals Co., Ltd.

Zeria Pharmaceutical Co., Ltd.

Takeshi Fujiwara

Hiroyuki Shiraishi

Hisaaki Kanda

Paul Kuad

Seiji Bando

Takehiro Hiyama

Katsumi Takano

Nami Matsuo

The purpose of the present invention is to provide a method for producing 2-halogenated benzoic acids, the method imparting high regioselectivity (high selectivity) and having a shorter reaction time than does the conventional reaction. This method for producing 2-halogenated benzoic acids, in order to achieve the above purpose, is characterized in that benzoic acids and a halogenating agent are reacted in the presence of an alkaline compound, making it possible to highly selectively obtain 2-halogenated benzoic acids.

Method for producing 2-halogenated benzoic acids

The present invention provides a diaryl sulfone compound represented by Formula (1): wherein Rto Rand Rto Rare the same or different, and each represents hydrogen, C-alkyl, or halogen, and Rrepresents Calkenyl, Calkyl, or aromatic heterocyclic group;

Diaryl sulfone compound, and manufacturing method for same

The present invention provides a diaryl sulfone compound represented by Formula (1) below: wherein Rto Rand Rto Rare the same or different; each represents hydrogen, Calkyl, or halogen; and Ris (thio)glycidyl, acryloyl, or the like; and a method for producing the same. According to the present invention, a novel compound useful as a monomer for producing synthetic resin having a high refractive index and excellent transparency for optical materials can be efficiently produced with a simple production process, using an inexpensive material as a starting material.

The present invention provides a method for producing a methylene disulfonate compound including reacting, in the presence of an acid and a dehydrating agent, a formaldehyde compound with at least one salt of alkanedisulfonic acid selected from the group consisting of alkali metal salts of alkanedisulfonic acid and alkaline earth metal salts of alkanedisulfonic acid each represented by a specific formula. According to the method of the present invention, a methylene disulfonate compound can be obtained in a simple manner at low cost.

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Hyogo, Japan

Takeshi Fujiwara