Mitsui Chemicals, Inc.

Hiroshi Sonoda

Hidetoshi Hayashi

Kouki Fukumura

Teruyuki Nagata

Junko Naruse

Kazunari Okada

Akira Takahashi

Hideaki Oikawa

Kenichi Goto

Yasuhiro Takano

Tsuyoshi Yasutake

Ken'ichi Goto

Takashi Shimaoka

Masahiko Kusumoto

Toshio Kitashima

Hideki Umetani

A method for producing an &agr;,&agr;-difluorocycloalkane at high purity with good efficiency, which comprises a step of treating a fluorocycloalkene with hydrogen fluoride wherein the fluorocycloalkene has one fluorine atom directly bonded to a carbon atom of carbon&mdash;carbon unsaturated double bond, more preferably, a step of directly adding the hydrogen fluoride to a reaction mixture obtained by treating the cycloalkanone with the de-oxygen fluorinating agent.

Process for producing &agr;, &agr;-difluorocycloalkane compound

Halogenating agents

Nitrogen-based halogenating agents and process for preparing halogen-containing compounds

Fluorination agent and preparation and use of same

Process for producing fluorinated silicon compound

Disclosed are a fluorinating agent represented by the general formula (1):

A preparation process of a fluorine substituted aromatic compound comprising reacting an alkali metal or alkali earth metal salt of an aromatic compound having a hydroxy group with an organic fluorinating agent is disclosed. As a representative fluorinating agent, a bis-dialkylamino-difluoromethane compound, for example, 2,2&prime;-difluoro-1,3-dimethylimidazolidine, is exemplified. According to the process, an industrially useful fluorinated aromatic compound, for example, a fluorobenzene, a fluorine substituted benzophenone, a fluorine substituted diarylsulfone can be prepared with ease in economy without specific equipment.

Preparation process of fluorine substituted aromatic compound

The invention has disclosed a trifluoroacetoxylation agent and a preparation process of the agent, which is safe and ease to handle, very useful in industry, and represented by the formula (1);

Tetraalkylfluoroformamidinium trifluoroacetate and preparation process of same

A preparation process of an acetylene derivative comprising reacting a compound having a skeleton represented by the formula (1): ##STR1## in the molecular formula with a compound represented by the formula (2): ##STR2## wherein R.sup.1, R.sup.2 R.sup.3 and R.sup.4 are individually an alkyl group having 1 to 6 carbon atoms and can be the same or different, R.sup.1 and R.sup.3 can bond each other to form a ring, and R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 can be bond each other to form one or two heterocyclic rings: or with a compound represented by the formula (3): wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same as in the formula (2), and X.sub.1 is a ##STR3## chlorine, bromine or iodine atom.

Process for preparing acetylene derivative from a ketone compound

Growing community of inventors

Fukuoka-ken, Japan

Hiroshi Sonoda