Disclosed is a method for preparing a solid material including manganese, the method including the following steps: a. bringing into contact an aqueous effluent including manganese, for example at least 5 mg/L, typically at least 5 to 50 mg/L, and preferably 7 to 25 mg/L of manganese, with an oxidizing agent, manganese, preferably at a temperature between 10° C. and 50° C., and obtaining an oxidized aqueous solution; b. adding a base to the oxidized aqueous solution obtained at the end of step a) until a pH of between 8 and 12, preferably greater than 9, and preferably from 9 to 10.5, and obtaining a solution including a precipitate; c. filtration of the solution obtained at the end of step b); and d. obtaining a solid material including manganese, and especially manganese (IV) and/or Mn (III).

A method for producing an α,β-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),

##STR00001##

A method for producing an α,β-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),

##STR00001##

The present invention relates to new malodour-counteracting agents of formula (I) or stereoisomers thereof, particularly useful in blocking the olfactory perception of androstenone, Formula (I), wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and X have the same meaning as that defined in the claims. The present invention also relates to consumer products comprising said agents. The present invention also relates to the use of said agents to suppress or attenuate undesirable odour, as well as to methods to suppress or attenuate undesirable odour employing said compounds. ##STR00001##

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 α,β-unsaturated aldehyde. The method includes a step of reacting a compound of formula (I) with a compound of formula (II) to provide an α,β-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). ##STR00001##

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 α,β-unsaturated aldehyde. The method includes a step of reacting a compound of formula (I) with a compound of formula (II) to provide an α,β-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). ##STR00001##

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).

##STR00001##

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).

##STR00001##

The regio-selective functionalization of a dialkyl benzene compound ##STR00001##
wherein the ratio of the compound functionalized at position (a) to the compound functionalized at the position (b) is at least 70:30, more particularly at least 80:20, still more particularly at least 85:15, and still more particularly at least 90:10, characterised in that the substituent R is an isobutyl group.

The regio-selective functionalization of a dialkyl benzene compound ##STR00001##
wherein the ratio of the compound functionalized at position (a) to the compound functionalized at the position (b) is at least 70:30, more particularly at least 80:20, still more particularly at least 85:15, and still more particularly at least 90:10, characterised in that the substituent R is an isobutyl group.