Abstract: 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.

Abstract: An aldehyde composition containing an aldehyde represented by Formula (1) and an aldehyde represented by Formula (2) is provided. A mass ratio [(1)/(2)] of the aldehyde represented by Formula (1) to the aldehyde represented by Formula (2) is from 96/4 to 99.97/0.03.

Abstract: The present invention has an object of providing a carboxylate compound that is useful as a raw material for fragrance compositions and has a fruity aroma, a method for producing the same, and a fragrance composition containing the carboxylate compound. The carboxylate compound of the present invention is represented by Formula (1). where, R is an alkyl group having from 2 to 6 carbons.

Abstract: 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), R1 represents a methyl group or an ethyl group, and R2 represents 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.

Abstract: A photosensitive resin composition including a polyimide resin (A) having a specific structure and a weight average molecular weight of 70000 or less is provided.

Abstract: The present invention has an object of providing a carboxylate compound that is useful as a raw material for fragrance compositions and has a fruity aroma, a method for producing the same, and a fragrance composition containing the carboxylate compound. The carboxylate compound of the present invention is represented by Formula (1). where, R is an alkyl group having from 2 to 6 carbons.

Abstract: The present invention provides a method for producing indancarbaldehyde, including a step of reacting indan with carbon monoxide in the presence of hydrogen fluoride and boron trifluoride to obtain a reaction liquid including indancarbaldehyde, wherein the indan includes an amine, and a content of the amine is less than 1000 ppm by mass.

Abstract: The present invention provides a method for producing indancarbaldehyde, including a step of reacting indan with carbon monoxide in the presence of hydrogen fluoride and boron trifluoride to obtain a reaction liquid including indancarbaldehyde, wherein the indan includes an amine, and a content of the amine is less than 1000 ppm by mass.