Abstract: The present invention provides a core block for a motor and a method for producing the core block, which can be efficiently produced and in which the size of a plastic region with poor properties that is formed on an electromagnetic steel sheet of the core block is reduced. This core block for a motor comprises electromagnetic steel sheets laminated on each other, said core block being obtained by carrying out an edge part forming process using electrical energy or optical energy to form the whole or part of the circumferences of edge parts of the electromagnetic steel sheets of the core block and carrying out press working to punch the electromagnetic steel sheets before or after the edge part forming process that uses electrical energy or optical energy.

Abstract: A method for producing a sulfoxide derivative represented by general formula (1), the method being characterized in that a sulfide derivative represented by general formula (2) is reacted with an oxidizing agent in the presence of a catalyst that is a metal-ligand complex containing a metal compound and, as a ligand, a compound represented by general formula (3), and in the presence of a benzoic acid compound represented by general formula (4)

Abstract: [Problem] To provide an industrially preferred method for producing a sulfoxide derivative. [Solution] A method for producing a sulfoxide derivative represented by general formula (1), the method being characterized in that a sulfide derivative represented by general formula (2) is reacted with an oxidizing agent in the presence of a catalyst that is a metal-ligand complex containing a metal compound and, as a ligand, a compound represented by general formula (3), and in the presence of a benzoic acid compound represented by general formula (4).