Abstract: To provide a method for performing a cross-coupling reaction of a Grignard compound with an alkyl halide simply, efficiently and in high yield, a method for obtaining a ?-bromo long chain carboxylic acid simply and efficiently using an easily obtainable raw material and a method for producing a useful branched fatty acid simply and efficiently [R1: an alkyl group having 1 to 15 carbon atoms, R2: an alkyl group having 1 to 30 carbon atoms with a carboxyl group and X and X?: a halogen atom] [n: an integer of 9 to 17] [n: an integer of 9 to 17, R1a: a branched alkyl group having 3 to 8 carbon atoms and X: a halogen atom].

Abstract: To provide a method for performing a cross-coupling reaction of a Grignard compound with an alkyl halide simply, efficiently and in high yield, a method for obtaining a ?-bromo long chaincarboxylic acid simply and efficiently using an easily obtainable raw material and a method for producing a useful branched fatty acid simply and efficiently.

Abstract: The invention relates to an amine derivative represented by the general formula (1): wherein R1 is a C1-C30 hydrocarbon group which may be interrupted by an ether linkage, with the proviso that phenyl and benzyl groups are excluded; one of A and B is and the other of them is —OR4; R2 and R3 are individually H, amidino group, alkanoyl group, C1-C20 hydrocarbon group, or the like; R4 and R5 are individually H, phosphoryl group, or the like, and an external skin care composition containing the same. The external skin care composition exhibits excellent preventing effects on aging of the skin, etc.

Abstract: Disclosed is an amine derivative represented by the following formula (1) or an acid addition salt thereof: ##STR1## wherein R.sup.1 represents a group ##STR2## a cyclopentyl group, cyclohexyl group, or a cycloheptyl group, R.sup.2 is a hydrogen atom or C1-C3 alkyl group which may be substituted by one or more hydroxyl groups, m is an integer falling in the range from 3 to 5 inclusive, and n is an integer falling in the range from 9 to 11 inclusive. Also, intermediates useful in the manufacture of the amine derivative (1), compositions for external application to the skin containing the amine derivative, and keratinization improvers containing the amine derivative as an active component are described. The compound (1) has excellent keratinization improving action, pigmentation preventing action, etc.

Abstract: The present invention relates to an amine derivative represented by the following general formula (I) or (II): ##STR1## wherein R.sup.1 means a heteroatom-containing C.sub.1 -C.sub.40 hydrocarbon group which may have a ring structure, or the like; R.sup.2 -R.sup.5 each denote a C.sub.1 -C.sub.20 hydrocarbon group, hydrogen or the like; A.sup.1 represents ##STR2## or R.sup.15 --Z--.sup.16 --(CH.sub.2).sub.n --; B.sup.1 stands for hydrogen, a C.sub.1 -C.sub.10 hydrocarbon group, nitrogen or the like; C.sup.1 denotes hydrogen, a C.sub.1 -C.sub.10 hydrocarbon group, nitrogen, alcohol residue, phosphoric acid residue or the like; a dermatologic preparation containing the same; and a process for producing the amine derivative. This amine derivative has excellent effects of smoothing or removing wrinkles and improving keratinization.

Abstract: A composition for external skin care comprising an amine derivative represented by the following formula (1), ##STR1## wherein R.sup.1 is a linear, branched, or cyclic saturated or unsaturated hydrocarbon group having 4-40 carbon atoms, and R.sup.2, R.sup.3, R.sup.4, R.sup.5, and R.sup.6 are individually a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms, which may be substituted or unsubstituted by 1 or more hydroxy groups; or an acid addition salt thereof, in an amount from 0.0001 to less than 0.1% by weight; and a method of curing wrinkles and keratinization of the skin characterized by applying said amine derivative or its salt to the skin.

Abstract: A composition for external skin care comprising an amine derivative represented by the following formula (1), ##STR1## wherein R.sup.1 is a linear, branched, or cyclic saturated or unsaturated hydrocarbon group having 4-40 carbon atoms, and R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are individually a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms, which may be substituted or unsubstituted by 1 or more hydroxy groups; or an acid addition salt thereof, in an amount from 0.0001 to less than 0.1% by weight; and a method of curing wrinkles and keratinization of the skin characterized by applying said amine derivative or its salt to the skin.

Abstract: Amino derivatives represented by the following general formula (1): ##STR1## and external skin care preparations containing such an amide derivative, are useful for preventing or curing skin roughness. Intermediates useful for the preparation of such amides are also disclosed.