Mitsubishi Gas Chemical Company, Inc.

Toru Shishimi

Yutaka Matsuura

Shinichi Nagao

Tatsuya Utamura

Tatsuyuki Kumano

An object of the present invention is to provide a method for producing 2,4-dialkylbenzaldehyde with excellent conversion rate and yield, and excellent regioselectivity for formylation, by allowing carbon monoxide to react on a starting material containing a specific m-dialkylbenzene in the presence of hydrogen fluoride and boron trifluoride. The method for producing 2,4-dialkylbenzaldehyde according to the present invention comprises a step of allowing carbon monoxide to react on a starting material containing m-dialkylbenzene represented by formula (1) in the presence of hydrogen fluoride and boron trifluoride for formylation at least at a position (a), wherein the starting material is a dialkylbenzene containing more than 90 mol % of m-dialkylbenzene represented by formula (1), and the number of moles of boron trifluoride relative to 1 mole of m-dialkylbenzene represented by formula (1) is 0.7 mol or more and 3.0 mol or less:

Method for producing 2,4-dialkylbenzaldehyde

Provided are a novel aldehyde compound suitable for a fragrance and a fragrance ingredient, or a raw material thereof, and a method for producing the aldehyde compound, as well as a fragrance composition containing the aldehyde compound as an active ingredient, and use of the aldehyde compound as a fragrance. A compound represented by Formula (1): where in Formula (1), R is a hydrogen atom or a methyl group.

Aldehyde compound and method for producing same, and fragrance composition

An object of the present invention is to provide a method for producing m-dialkylbenzaldehyde by using a reaction starting material containing 1,4-dialkylbenzene. The method for producing m-dialkylbenzaldehyde represented by formula (3), comprising a step of allowing carbon monoxide to react on a reaction starting material containing 1,4-dialkylbenzene represented by formula (1) in the presence of a Bronsted acid and a Lewis acid, wherein the reaction starting material is 1,4-dialkylbenzene represented by formula (1), or a mixture of 1,4-dialkylbenzene represented by formula (1) and 1,3-dialkylbenzene represented by formula (2), containing 10 mol % or more of the 1,4-dialkylbenzene represented by formula (1), wherein in formulae (1) to (3), Rrepresents a methyl group or an ethyl group, and Rrepresents a chain or cyclic alkyl group having 3 or more and 6 or less carbon atoms that has a tertiary carbon at the benzyl position.

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Okayama, Japan

Toru Shishimi