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(O)R 1 , C(O)OR 1 , C(O)Cl, C(O)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(O)R 1 , OSO 2 R 1 , SR 1 , S-acyl, SC(O)R 1 , N(R 1 )acyl, N(R 1 )C(O)R 1 , N(R 1 )SO 2 R 1 , N(acyl) 2 , N[C(O)R 1 ]SO 2 R 1 , N[C(O)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(O)R 1 , C(O)OR 1 , C(O)Cl, C(O)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(O)R 1 , OSO 2 R 1 , SR 1 , S-acyl, SC(O)R 1 , N(R 1 )acyl, N(R 1 )C(O)R 1 , N(R 1 )SO 2 R 1 , N(acyl) 2 , N[C(O)R 1 ]SO 2 R 1 , N[C(O)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 . <EOS>