Abstract: A process for producing an ?-substituted acrylic norbornanyl compound represented by the formula [3] includes reacting an ?-substituted acrylic acid anhydride represented by the formula [1] with a substituted norbornanyl alcohol represented by the formula [2]. wherein R1 represents a hydrogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, fluoromethyl group, difluoromethyl group, trifluoromethyl group, or perfluoroethyl group, and wherein one of R2, R3 and R4 is a CF3C(CF3)(OH)CH2— group, and each of the other two of R2, R3 and R4 is a hydrogen.

Abstract: The invention relates to a novel compound, 3-hydroxypropyl ester of 2-trifluoromethyl acrylic acid, represented by the formula [1]. The invention further relates to a process for producing the compound.

Abstract: The invention relates to a novel compound, 3-hydroxypropyl ester of 2-trifluoromethyl acrylic acid, represented by the formula [1]. The invention further relates to a process for producing the compound. This process includes reacting 2-trifluoromethylacrylic halide represented by the formula [2], wherein the halogen atom is F or Cl, with 1,3-propanediol represented by the formula [3], in the presence of a base.

Abstract: A process for producing an ?-substituted acrylic norbornanyl compound represented by the formula [3] includes reacting an ?-substituted acrylic acid anhydride represented by the formula [1] with a substituted norbornanyl alcohol represented by the formula [2]. wherein R1 represents a hydrogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, fluoromethyl group, difluoromethyl group, trifluoromethyl group, or perfluoroethyl group, and wherein one of R2, R3 and R4 is a CF3C(CF3)(OH)CH2— group, and each of the other two of R2, R3 and R4 is a hydrogen.

Abstract: Optically active tryptophan is crystallized by a modification of a method of crystrallization of optically active tryptophan through neutralization by mixing an acidic or alkaline aqueous solution of optically active tryptophan, which is obtained by the removal of impurities from an acidic or alkaline aqueous solution of optically active tryptophan containing impurities which inhibit flocculation and crystallization of optically active tryptophan, with an alkali or an acid, by combining portions of an alkali or acid with portions of an acidic or alkaline aqueous solution of optically active tryptophan, from which the impurities have been removed, thereby neutralizing the aqueous solution containing optically active tryptophan such that the pH of the solution to be crystallized is kept in a range of 3 to 8, and simultaneously crystallizing optically active tryptophan as flocculated crystals.