Takasago International Corporation

Tokyo University of Agriculture and Technology

National University Corporation Tokyo University of Agriculture and Technology

Tomohiko Hakamata

Hideki Nara

Taichiro Touge

Hiroyuki Matsuda

Ken Tanaka

Tohru Yokozawa

Hideo Ujihara

Hiroki Ito

A fragrance composition contains (3S)-(6E)-2,3-dihydrofarnesal. A chemical purity of the (3S)-(6E)-2,3-dihydrofarnesal is 90 mass % or more and an optical purity of the (3S)-(6E)-2,3-dihydrofarnesal is 50% e.e. or more. A fragrance or cosmetic contains the fragrance composition. An odor is improved by using the fragrance composition containing (3S)-(6E)-2,3-dihydrofarnesal having a chemical purity of 90 mass % or more and an optical purity of 50% e.e. or more.

Fragrance composition

The present invention provides a method for producing a compound represented by general formula (1) (wherein R, R, R, R-R, A-A, nand nare as defined in the description), which is characterized by reacting a compound represented by general formula (2) (wherein R-R, A-A, n, nand B are as defined in the description) with a diamine compound represented by general formula (3) (wherein R-Rare as defined in the description). The present invention is a method for producing a diamine compound, which is useful for the formation of a ruthenium-diamine complex, under mild conditions, said method being able to be put in industrial practice. 

Method for producing diamine compound

Provided is a ruthenium complex that is represented by general formula (1*) and is useful as an asymmetric reduction catalyst. (In the formula, * is an asymmetric carbon atom; Ris an arenesulfonyl group, and the like; Rand Rare a phenyl group, and the like; Rthrough Rare selected from a hydrogen atom, Calkyl group, and the like, but Rthrough Rare not simultaneously hydrogen atoms; X is a halogen atom and the like; j and k are each either 0 or 1; and j+k is 0 or 2.) 

Ruthenium-diamine complex and method for producing optically active compound

An optically active compound represented by the following formula (5): wherein, in the formula (5), Rand Rmay be the same or different are an alkyl group optionally having a substituent group selected from the group consisting of an alkoxy group and a halogen atom, a cycloalkyl group optionally having a substituent group selected from the group consisting of an alkoxy group and a halogen atom, an aryl group optionally having a substituent group selected from the group consisting of an alkyl group, an alkoxy group and a halogen atom, an alkoxy group optionally having a substituent group selected from the group consisting of a halogen atom and an aryl group or an aryloxy group optionally having a substituent group selected from the group consisting of an alkyl group, an alkoxy group and a halogen atom; a1 and a2 independently are 0 or 1; and * is axial asymmetry.

Growing community of inventors

Hamamatsu, Japan

Tomohiko Hakamata