CYANOGEN-HALIDE PRODUCTION METHOD, CYANATE ESTER COMPOUND AND PRODUCTION METHOD THEREFOR, AND RESIN COMPOSITION

Upon production of a cyanate ester compound, it is an object of the present invention to provide a method for efficiently producing a cyanogen halide with suppressed side effects, and a method for producing a high-purity cyanate ester compound at a high yield. A method for producing the cyanogen halide, which includes a cyanogen halide-producing step of contacting a halogen molecule with an aqueous solution containing hydrogen cyanide and/or a metal cyanide, so that the hydrogen cyanide and/or the metal cyanide is allowed to react with the halogen molecule in the reaction solution to obtain the cyanogen halide, wherein, in the cyanogen halide-producing step, more than 1 mole of the hydrogen cyanide or the metal cyanide is used based on 1 mole of the halogen molecule, and when an amount of substance of an unreacted hydrogen cyanide or an unreacted metal cyanide is defined as mole (A) and an amount of substance of the generated cyanogen halide is defined as mole (B), the reaction is terminated in a state in which (A) : (A) + (B) is between 0.00009 : 1 and 0.2 : 1.