A process for the preparation of organic halide of formula from a carboxylic acid of formula represented by scheme 1: said process comprises radical halo-de-carboxylation reaction comprising reacting carboxylic acid with a chloroisocyanurate and a brominating agent to yield organic halide; wherein said chloroisocyanurate is trichloroisocyanuric acid, dichloroisocyanuric acid, or any combination thereof; A is arene, alkane, cycloalkane or saturated heterocycle; n is an integer greater than or equal to 1; X is Cl or Br; wherein if n > 1, then X may be the same or different; k is an integer greater than or equal to 0; Y is Cl or Br; wherein if k > 1, then Y may be the same or different; m is an integer greater than or equal to 0; each Q is independently F, Cl, Br, R 1, acyl, C R 1, C OR 1, C Cl, C N(R 1) 2, CN, SO 2 R 1, SO 3 R 1, NO 2, N(R 1) 3 +, OR 1, OCF 3, O-acyl, OC R 1, OSO 2 R 1, SR 1, S-acyl, SC R 1, N(R 1)acyl, N(R 1)C R 1, N(R 1)SO 2 R 1, N(acyl) 2, N[C R 1]SO 2 R 1, N[C R 1] 2, CF 3; or any two vicinal Q substituents are joined to form a 5- or 6-membered substituted or unsubstituted, saturated or unsaturated carbocyclic or heterocyclic ring; wherein each R 1 is independently aryl, alkyl, cycloalkyl or heterocyclyl, wherein said R 1 is optionally substituted by one or more substituents of R 2; wherein each R 2 is independently F, Cl, Br, COOH, acyl, aryl, alkyl, cycloalkyl or heterocyclyl; wherein if either one of R 2 in is carboxylic group COOH, then the respective R 2 in is Br or Cl; wherein the position of said X, Y and Q in said structure of formula correspond to the same position of said COOH, Br and Q, respectively in said structure of formula. A is arene, alkane, cycloalkane or saturated heterocycle; n is an integer greater than or equal to 1; X is Cl or Br; wherein if n > 1, then X may be the same or different; k is an integer greater than or equal to 0; Y is Cl or Br; wherein if k > 1, then Y may be the same or different; m is an integer greater than or equal to 0; each Q is independently F, Cl, Br, R 1, acyl, C R 1, C OR 1, C Cl, C N(R 1) 2, CN, SO 2 R 1, SO 3 R 1, NO 2, N(R 1) 3 +, OR 1, OCF 3, O-acyl, OC R 1, OSO 2 R 1, SR 1, S-acyl, SC R 1, N(R 1)acyl, N(R 1)C R 1, N(R 1)SO 2 R 1, N(acyl) 2, N[C R 1]SO 2 R 1, N[C R 1] 2, CF 3; or any two vicinal Q substituents are joined to form a 5- or 6-membered substituted or unsubstituted, saturated or unsaturated carbocyclic or heterocyclic ring; wherein each R 1 is independently aryl, alkyl, cycloalkyl or heterocyclyl, wherein said R 1 is optionally substituted by one or more substituents of R 2; wherein each R 2 is independently F, Cl, Br, COOH, acyl, aryl, alkyl, cycloalkyl or heterocyclyl; wherein if either one of R 2 in is carboxylic group COOH, then the respective R 2 in is Br or Cl; wherein the position of said X, Y and Q in said structure of formula correspond to the same position of said COOH, Br and Q, respectively in said structure of formula. wherein each R 1 is independently aryl, alkyl, cycloalkyl or heterocyclyl, wherein said R 1 is optionally substituted by one or more substituents of R 2; wherein each R 2 is independently F, Cl, Br, COOH, acyl, aryl, alkyl, cycloalkyl or heterocyclyl; wherein if either one of R 2 in is carboxylic group COOH, then the respective R 2 in is Br or Cl; wherein the position of said X, Y and Q in said structure of formula correspond to the same position of said COOH, Br and Q, respectively in said structure of formula.