Abstract: A fragrance composition including a cis isomer and a trans isomer. The cis isomer includes a compound represented by formula (Ia), a compound represented by formula (Ib), a compound represented by formula (IIa), and a compound represented by formula (IIb), the trans isomer includes a compound represented by formula (IIIa), a compound represented by formula (IIIb), a compound represented by formula (IVa), and a compound represented by formula (IVb), and a mass ratio of the cis isomer to the trans isomer [cis isomer:trans isomer] is 65:35 or more and 95:5 or less. In the formulae (Ia), (Ib), (IIa), (IIb), (IIIa), (IIIb), (IVa), and (IVb), R1 is an alkyl group having 1 or more and 5 or less of carbon atoms, and R2 is a hydrogen atom or an alkyl group having 1 or more and 4 or less of carbon atoms.

Abstract: A method for producing an ?,?-unsaturated aldehyde, including reacting a compound represented by formula (I) with a compound represented by formula (II) in the presence or absence of a solvent to provide a compound represented by formula (III), wherein titanium oxide is used as a catalyst, and an amount of the solvent is 50 parts by mass or less relative to 100 parts by mass in total of the compound of formula (I) and the compound of formula (II),

Abstract: Provided are cobalt ferrite particles having a micrometer-order average particle diameter and similar particle diameters. When a cobalt ferrite precursor is treated at a high temperature and a high pressure, an oxidation reaction is caused in the presence of a complexing agent, thereby obtaining intended cobalt ferrite magnetic particles.

Abstract: Provided are magnetic particles (cobalt ferrite) having a micrometer-order average particle diameter and similar particle diameters. A cobalt ferrite precursor is heated in the presence of a sulfite, thereby obtaining intended cobalt ferrite magnetic particles.

Abstract: The present invention aims to provide a method for preparing an aldehyde, which can prepare a target aldehyde with high selectivity and can also suppress the production of by-products. The present invention relates to a method for preparing an ?,?-unsaturated aldehyde. The method includes a step of reacting a compound of formula (I) with a compound of formula (II) to provide an ?,?-unsaturated aldehyde of formula (III). An alkali metal hydroxide and an alkanol having 1 to 4 carbon atoms are used in the step. The amount of the alkali metal hydroxide is 8 mol % or more and 12 mol % or less with respect to the compound of formula (I). The total amount of water contained in materials that are used in the reaction is 10 mol % or more and 50 mol % or less with respect to the compound of formula (I).

Abstract: The present invention aims to provide a method for preparing an aldehyde, which can prepare a target aldehyde with high selectivity and can also suppress the production of by-products. The present invention relates to a method for preparing an ?,?-unsaturated aldehyde. The method includes a step of reacting a compound of formula (I) with a compound of formula (II) to provide an ?,?-unsaturated aldehyde of formula (III). An alkali metal hydroxide and an alkanol having 1 to 4 carbon atoms are used in the step. The amount of the alkali metal hydroxide is 8 mol % or more and 12 mol % or less with respect to the compound of formula (I). The total amount of water contained in materials that are used in the reaction is 10 mol % or more and 50 mol % or less with respect to the compound of formula (I).

Abstract: Provided is a method for producing aldehydes that brings an excellent alcohol conversion and aldehyde selectivity while suppressing generation of aldol condensates, etc. The method for producing aldehydes includes a step of dehydrogenating primary alcohol in the presence of a catalyst composition. The catalyst composition is a first catalyst composition obtained by adding a potassium salt of a weak acid to a dehydrogenation catalyst containing copper as an active species.

Abstract: Provided is a method for producing aldehydes that brings an excellent alcohol conversion and aldehyde selectivity while suppressing generation of aldol condensates, etc. The method for producing aldehydes includes a step of dehydrogenating primary alcohol in the presence of a catalyst composition. The catalyst composition is a first catalyst composition obtained by adding a potassium salt of a weak acid to a dehydrogenation catalyst containing copper as an active species.

Abstract: Provided is a method for producing an aldehyde that provides a target aldehyde at a high conversion rate over an extended period of time. It is a method for producing an aldehyde comprising bringing a raw material gas containing a primary alcohol having 4 to 18 carbon atoms and water into contact with a dehydrogenation catalyst containing copper and iron so as to dehydrogenate the alcohol contained in the raw material gas, thereby obtaining an aldehyde, wherein the raw material gas has a water partial pressure of 0.2 kPa to 99 kPa.

Abstract: Provided is an aldehyde production method that can provide target aldehydes with excellent aldehyde selectivity and a high conversion for a long period of time. The method includes bringing a mixed gas containing a vaporized primary alcohol and an inert gas into contact with a film-type dehydrogenation catalyst so as to dehydrogenate the primary alcohol in the mixed gas, thereby obtaining an aldehyde. The partial pressure of the primary alcohol in the mixed gas is 50 kPa or lower, and the film-type dehydrogenation catalyst is formed by providing a thin film catalyst layer on a support.

Abstract: Provided is a method for producing an aldehyde that provides a target aldehyde at a high conversion rate over an extended period of time. It is a method for producing an aldehyde comprising bringing a raw material gas containing a primary alcohol having 4 to 18 carbon atoms and water into contact with a dehydrogenation catalyst containing copper and iron so as to dehydrogenate the alcohol contained in the raw material gas, thereby obtaining an aldehyde, wherein the raw material gas has a water partial pressure of 0.2 kPa to 99 kPa.

Abstract: The present invention relates to [1] a method of producing 1-(2-t-butylcyclohexyloxy)-2-butanol including a step of hydrogenating 1-(2-t-butylphenyloxy)-2-butanol under a condition at a hydrogen pressure of from 1 to 5 MPa in the presence of a palladium catalyst (A) supported on peat-derived active carbon and a metal catalyst (B) containing one or more kinds of members selected from ruthenium, rhodium, platinum, and nickel; and [2] a perfume composition containing 1-(2-t-butylcyclohexyloxy)-2-butanol obtained by the foregoing method. According to the present invention, 1-(2-t-butylcyclohexyloxy)-2-butanol having a woody or amber-like fragrance as a perfume material and excellent fragrance notes can be obtained in a high purity because of a small remaining amount of a reaction intermediate and in a high yield.

Abstract: Provided is an aldehyde production method that can provide target aldehydes with excellent aldehyde selectivity and a high conversion for a long period of time. The method includes bringing a mixed gas containing a vaporized primary alcohol and an inert gas into contact with a film-type dehydrogenation catalyst so as to dehydrogenate the primary alcohol in the mixed gas, thereby obtaining an aldehyde. The partial pressure of the primary alcohol in the mixed gas is 50 kPa or lower, and the film-type dehydrogenation catalyst is formed by providing a thin film catalyst layer on a support.

Abstract: The present invention relates to [1] a method of producing a 1-(2-t-butylcyclohexyloxy)-2-alkanol including a step of adjusting a raw material mixture containing a 1-(2-t-butylphenyloxy)-2-alkanol represented by the formula (1) to a pH of from 7.5 to 10.0 and hydrogenating it in the presence of a palladium catalyst (A) and a metal catalyst (B) containing one or more kinds of members selected from ruthenium, rhodium, platinum, and nickel; and [2] a perfume composition containing a 1-(2-t-butylcyclohexyloxy)-2-alkanol obtained by the foregoing method. The present invention provides a method of efficiently producing a 1-(2-t-butylcyclohexyloxy)-2-alkanol having a high trans-isomer content and a strong woody or amber-like fragrance as a perfume material and also having excellent persistence of aroma. (In the formula, R1 is a methyl group or an ethyl group.

Abstract: The present invention relates to [1] a method of producing 1-(2-t-butylcyclohexyloxy)-2-butanol including a step of hydrogenating 1-(2-t-butylphenyloxy)-2-butanol under a condition at a hydrogen pressure of from 1 to 5 MPa in the presence of a palladium catalyst (A) supported on peat-derived active carbon and a metal catalyst (B) containing one or more kinds of members selected from ruthenium, rhodium, platinum, and nickel; and [2] a perfume composition containing 1-(2-t-butylcyclohexyloxy)-2-butanol obtained by the foregoing method. According to the present invention, 1-(2-t-butylcyclohexyloxy)-2-butanol having a woody or amber-like fragrance as a perfume material and excellent fragrance notes can be obtained in a high purity because of a small remaining amount of a reaction intermediate and in a high yield.

Abstract: The present invention relates to [1] a method of producing a 1-(2-t-butylcyclohexyloxy)-2-alkanol including a step of adjusting a raw material mixture containing a 1-(2-t-butylphenyloxy)-2-alkanol represented by the formula (1) to a pH of from 7.5 to 10.0 and hydrogenating it in the presence of a palladium catalyst (A) and a metal catalyst (B) containing one or more kinds of members selected from ruthenium, rhodium, platinum, and nickel; and [2] a perfume composition containing a 1-(2-t-butylcyclohexyloxy)-2-alkanol obtained by the foregoing method. The present invention provides a method of efficiently producing a 1-(2-t-butylcyclohexyloxy)-2-alkanol having a high trans-isomer content and a strong woody or amber-like fragrance as a perfume material and also having excellent persistence of aroma. (In the formula, R1 is a methyl group or an ethyl group.